View and export
CAD drawings on Windows
CAD Explorer adds native DWG and DXF support to Windows Explorer — thumbnails and previews — plus a dedicated app for viewing, zooming, inspecting document properties, and exporting your drawings to images, PDF, and SVG.
Installation
CAD Explorer is distributed through the Microsoft Store as a single package that installs both the desktop app and the Windows Explorer shell extensions.
No configuration needed. After installation, DWG and DXF thumbnails and the preview pane work automatically in Windows Explorer. Just navigate to a folder containing CAD files.
What gets installed
CAD Explorer App
A desktop app for opening, viewing, and exporting DWG and DXF files. Accessible from the Start menu.
Shell Extensions
Background components that power thumbnails and the preview pane in Windows Explorer. These run automatically — no action needed.
The Interface
CAD Explorer has a simple left-hand navigation. You can open a drawing by clicking Open a CAD file, dragging a file onto the window, or launching it from Windows Explorer.
Opening a file is required before the CAD document, Properties, and Export pages become usable. The Home page always offers an Open a CAD file button to get started.
Opening a file
There are three ways to open a drawing in the app:
- Click Open a CAD file on the Home or CAD document page and pick a
.dwgor.dxffile from the browser dialog. - Drag and drop a CAD file from Windows Explorer directly onto the CAD Explorer window.
- In Windows Explorer, right-click a DWG or DXF file and choose Open with → CAD Explorer. The app opens and goes straight to the CAD document page.
Single instance: CAD Explorer runs as a single window. If you open it from Explorer while it's already open, the existing window is brought to the front and the new drawing is loaded — you won't get a second window.
Windows Explorer Integration
Once CAD Explorer is installed, Windows Explorer gains two new capabilities for DWG and DXF files — no extra steps required.
Thumbnails
DWG and DXF files display their actual drawing content as a thumbnail in Explorer's icon view, so you can recognise a drawing without opening it.
Preview Pane
Select a CAD file and press Alt+P (or use View → Preview Pane) to see a live, zoomable preview directly inside Explorer — no app launch needed.
Reset Thumbnails
If thumbnails ever look stale after changing settings, a single button in Settings refreshes Explorer's thumbnail cache.
When the trial has ended. Once the free trial is over and the app is not licensed, Windows no longer starts CAD Explorer at all. File Explorer then shows the file type's plain icon instead of a thumbnail, the preview pane stays empty, and the details CAD Explorer adds are not shown. With Better Shell Integration installed you see a small Trial expired placeholder and a trial notice in the preview pane instead. Opening a file with the app shows an error, see File system error (-2143322102). Get the app from the Microsoft Store to restore everything. Your files are never changed.
Why a few thumbnails still show. With the trial over you still see real thumbnails here and there, mixed in with the plain icons. Two things produce them. Windows keeps a thumbnail cache of its own, so pictures made while CAD Explorer was licensed stay in the folders you have already visited, until that cache is rebuilt. And with Better Shell Integration installed, the first files a fresh Explorer session asks about can still be drawn, because CAD Explorer answers Explorer straight away rather than hold it up while the Store confirms the licence, and those few are cached as well. A mix of icons and thumbnails is expected, it does not mean the trial is still running. The leftovers go away on their own as Windows rebuilds its cache.
Using the Preview Pane
The preview pane renders your drawing at full quality. Here's what you can do inside it:
| Action | How |
|---|---|
| Zoom in / out | Hold Ctrl and scroll the mouse wheel, up to 100,000%, the same as the app |
| Scroll the drawing | Use the scroll bar or scroll the mouse wheel |
| Pan the drawing | Once zoomed in past the fit, drag it with the left mouse button |
| Model space framing | Right-click the preview and choose Fit to window or Saved view |
| Change background | Right-click the preview for a list of background colours |
By default the preview fits the whole drawing to the pane, scaled to both width and height with the aspect ratio kept and a small margin, centered, and it rescales as you resize the pane. For a drawing that carries a saved view, the area and zoom it was last saved showing, you can switch to that from the preview's right-click menu for the current file. The default framing is set in Settings.
Layouts & preview image in the pane
When a drawing has more than one layout, the preview pane shows them as tabs across the top. A drawing with many layouts collapses those tabs into a compact dropdown so the names stay readable. Click it to pick a layout.
If the drawing carries an embedded preview image, a Preview tab is added at the end that shows it, the same as in the app. A 3D drawing with no 2D geometry shows a short "No renderable 2D geometry to display" note on its layout, and the recorded image is a click away on that Preview tab.
How thumbnails are produced
You control how DWG and DXF thumbnails are generated in Settings. Many DWG files contain an embedded thumbnail saved by the authoring application — using it is much faster than rendering the drawing, so the default mode prefers it and falls back to rendering when none is present.
Faster browsing of large folders: if you mostly care about speed, set the DWG thumbnail mode to Only get thumbnail if available. For the most accurate previews, choose Render default layout instead.
Better Shell Integration (administrator required)
CAD Explorer can register its drawing handlers with Windows itself. This turns on the thumbnails, the preview pane, and the Explorer file details / properties for all DWG and DXF drawings. Because it changes the machine, Windows asks for administrator approval when you turn it on or off.
This is optional. The CAD Explorer app itself works without it. Turn it on when you want DWG and DXF thumbnails, previews, and details in File Explorer even when another app is the default for these files.
It works even when another app is your default. If you open drawings in another CAD application and keep it as your default, CAD Explorer still supplies the thumbnails, previews, and details. Windows uses them as a fall-through when your chosen app doesn't provide its own, and your default app for double-click stays exactly as you set it.
For your account, not everyone on the PC. Installing it needs an administrator, but it only works for a Windows account that has CAD Explorer installed and licensed. If the app is uninstalled, the thumbnails, previews, and details stop working too, even while the integration is still listed.
Install, update, uninstall
Everything is done from Settings → Shell Integration. The card shows the current status and the matching action button, and each action prompts for administrator approval (a standard Windows UAC dialog).
| Status | Meaning | Button |
|---|---|---|
| Not installed | CAD Explorer's drawing handlers are not registered with Windows on this PC. | Install |
| Installed | Registered on this PC and current. | Reinstall / Uninstall |
| Installed, update available | A newer build ships with this app version than the one registered. | Update / Uninstall |
Listed in Windows. It also appears in Settings → Apps → Installed apps as "CAD Explorer Preview Shell Integration", and can be removed there at any time, independently of the CAD Explorer app.
Give it a minute. After you install it, thumbnails can take a while to appear. Windows caches how it resolves thumbnail handlers, separately from the picture cache, so a folder may show the old icons for a bit. Wait a little, or run Reset Thumbnails (see Settings) and press F5.
Why it needs administrator, and why updates are separate
Windows resolves thumbnail and preview handlers from a location that only an administrator can write. That is why this integration asks for approval. It's copied to a stable folder outside the app package, so it keeps working across app updates. Because it lives outside the app package it doesn't update itself, so a newer app version flags update available and one click refreshes it.
Viewing Drawings
The CAD document page is CAD Explorer's main viewer. It renders your drawing with high-fidelity vector graphics and lets you zoom and inspect it in detail. By default a drawing opens framed on its saved view, the area and zoom it was last saved showing, and the framing you pick in the viewer is remembered for the next drawings you open.
Zoom & fit
Use the Zoom dropdown at the top of the page to jump to a preset zoom level, or type a custom percentage. While looking at the drawing, hold Ctrl and scroll the mouse wheel to zoom smoothly, the dropdown follows the current zoom level. At 100% the drawing fits the window, and you can zoom out to 1% or in to 100,000%, far enough to read the detail of a whole city map street by street. Once zoomed in, drag the drawing with the left mouse button to pan it.
A Saved view toggle and three fit buttons at the top of the page frame the drawing instantly:
| Button | What it does |
|---|---|
| Saved view | Frames model space on the view the drawing was saved showing (the default in the app). Turn it off to fit to window. See below. |
| Fit | Scales the whole drawing to fit inside the window |
| Fit width | Scales so the drawing's width fills the window |
| Fit height | Scales so the drawing's height fills the window |
Saved view
Every drawing remembers the view it was last saved showing — the exact area and zoom. CAD Explorer frames model space on that saved view by default, so a drawing opens looking the way you left it, the same as it would in AutoCAD. This also avoids the "zoomed all the way out" look a drawing can get when a stray object sits far from everything else, which would otherwise pull a fit-to-window view very wide.
The Saved view toggle sits with the fit buttons. Turn it off, or click any fit button, to frame the whole drawing instead. It applies to model space only, and is available only when the drawing carries a saved view — paper-space layouts always fit their sheet, and drawings without a saved view open with the fit you last used.
Whether model space opens on its saved view or fits to the window is set in Settings, separately for the app viewer and for the Explorer preview pane. The app viewer defaults to the saved view, the preview pane defaults to fit to window.
In the app, your last choice on the page is also remembered: turning the Saved view toggle on or off, or picking one of the fit buttons, updates that setting, and the next drawings open the same way, fit width included. A drawing without a saved view opens with the fit you last used.
Some drawings, often exported by other applications, carry a saved view that shows none of the drawing, an empty corner far from the geometry. CAD Explorer recognizes such a view and ignores it, so the drawing fits the window instead of opening on a blank screen.
Layouts
A CAD drawing can contain a model space plus one or more paper-space layouts. CAD Explorer lists the available layouts so you can switch between them — handy for drawings with several sheets. A minimal DXF that only contains model-space geometry shows a single Model entry.
Preview image tab
Many drawings carry an embedded preview image, the picture the authoring application saved with the file. When one is present, CAD Explorer adds a Preview tab next to the layouts that shows it. This is especially handy for 3D drawings whose layouts render little or nothing (see Limitations), so you can still see what the drawing looks like. The Preview tab zooms and pans with the same fit, zoom, and scroll controls as a layout.
Background & transparency
Use the Transparency colour control to set the background shown behind the drawing, including a fully transparent option. Your choice is remembered the next time you open the app and is also used as the fill when you export to a format that doesn't keep transparency.
CAD drawings are vector data, so they are drawn again at every zoom level and stay sharp all the way to 100,000%, where a bitmap would have turned to blocks long before. If a layout contains nothing CAD Explorer can draw, the viewer shows a "No renderable 2D geometry to display" message — try another layout (see Limitations).
Document Properties
The Properties page inside the app shows information about the open drawing — both file facts and the metadata stored inside the CAD file.
| Property | Description |
|---|---|
| Name | The drawing's file name |
| Format | DWG or DXF (and the detected version where available) |
| Folder | Where the file is stored |
| Size | File size on disk |
| File modified | Last time the file changed on disk |
Drawings authored in AutoCAD-compatible tools often carry summary information such as title, author, subject, and keywords. CAD Explorer reads these and shows them on this page, and can carry them through to your exports — see Include metadata. (This information is shown inside the app; it isn't added to Windows Explorer's own Details pane.)
Exporting
CAD Explorer can convert your drawing into raster images, PDF, or SVG. There are three dedicated export pages — Export as images, Export as PDF, and Export as SVG — that share the same workflow. You can export several sizes, and one file per layout, in a single click.
Images
Raster output (PNG, JPEG, and more). Each size becomes its own pixel-perfect file.
Vector PDF that stays sharp at any zoom. Optionally embeds the drawing's document metadata.
SVG
Vector SVG for the web and editors such as Inkscape. Optionally embeds Dublin Core metadata.
Export settings
| Setting | Description |
|---|---|
| Output folder | Where exported files are saved. Click Browse to pick a folder, or Open to view the current destination in Explorer. The folder is created if it doesn't exist. |
| File name template | Controls how exported files are named, using tokens like {name}, {layout}, and {size} — see the token reference. A live sample shows what the file name will look like. |
| Image format | (Images page only) the output format: PNG, JPEG, BMP, TIFF, and others registered on your system. See the full list. |
| Overwrite | When on, existing files with the same name are overwritten. When off, existing files are skipped with a warning. |
| Preserve transparency | When on, transparent areas are kept. When off, they're filled with the background colour set on the CAD document page. Available for formats that support an alpha channel, and always for PDF and SVG. |
| Include metadata | (PDF and SVG) embeds the drawing's title, author, subject, keywords, and dates into the exported file's metadata. |
Export sizes
Each row in the size list produces one output file. The number is a pixel size: the drawing's longest side is scaled to that many pixels and the other dimension scales proportionally. Default sizes are 256, 512, 1024, and 2048 pixels.
Add output size
Adds the next standard size (256 → 512 → 1024 → 2048). Once all standard sizes are present, it doubles the largest existing size.
Clear all / Remove
Click Clear all to remove every size, or Remove next to a single row to delete just that one.
You can also edit a size number directly in any row. Sizes are always sorted smallest to largest.
Exporting layouts
When the drawing has multiple layouts, CAD Explorer can export each selected layout to its own file. Because several files would otherwise collide, the {layout} token becomes required in the file name template whenever more than one layout is exported. You can choose whether exports default to the model layout only or all layouts in Settings.
Running an export
- Open a drawing on the CAD document page first.
- Go to Export as images, Export as PDF, or Export as SVG.
- Set your output folder, format (images), sizes, and any options.
- Click the blue Export button. A notification confirms how many files were saved.
The Export button is disabled if the output folder is invalid, the file name template is missing {size} (or {layout} when exporting multiple layouts), no sizes are listed, or no format is selected. A red message explains what needs fixing.
Recent Files
The Recent files page keeps a list of drawings you've opened before, so you can jump back to them quickly.
| Action | Description |
|---|---|
| Click a file link | Opens that drawing in the viewer. |
| Clear recent files | Removes all entries from the history. You'll be asked to confirm if the list isn't empty. |
| Remove missing files | Scans the list and removes entries for files that have been deleted or moved. |
You can turn recent-file history off entirely in Settings if you prefer not to track recently opened drawings.
Settings
The Settings page groups the app's options. Most viewing and export choices are made in context (zoom and background on the CAD document page, options on each export page).
Appearance & behavior
| Setting | Options | Description |
|---|---|---|
| App theme | Light Dark System | Controls the app's colour scheme. Use system setting follows your Windows light/dark mode. |
| Layout choice for exports | Model All | What layouts are selected by default when you open an export page. |
| Save recent files history | On / Off | When off, CAD Explorer stops recording recently opened drawings. If you turn it off with entries present, you're asked whether to clear or keep them. |
| Model space framing (app viewer) | Saved view Fit to window | How model space is framed when you open a drawing in the app. Saved view (the default) frames it the way the drawing was saved showing, like AutoCAD. Fit to window shows the whole drawing. The toolbar on the CAD document page changes it too, so the next drawings open the way you last framed one there. Drawings without a saved view open with the fit you last used. |
Explorer thumbnails integration
| Setting | Options | Description |
|---|---|---|
| DWG files | Thumbnail then render Thumbnail only Render Disable | How thumbnails are produced for DWG files. Using the embedded thumbnail (when present) is fastest; rendering is most accurate. |
| DXF files | Render Disable | Whether DXF files get rendered thumbnails (DXF files don't carry an embedded thumbnail). |
| Model space framing (preview pane) | Saved view Fit to window | How model space is framed in the Windows Explorer preview pane. Fit to window (the default) shows the whole drawing, which suits a quick glance. You can still switch for the current file from the preview's right-click menu. |
| Reset Explorer thumbnails | Button | Forces Windows Explorer to refresh all thumbnails so thumbnail-setting changes take effect. |
Shell integration
The Shell Integration card installs, updates, or removes the registration that makes CAD Explorer's thumbnails, preview, and details show even when another CAD application is your default. Each action needs administrator approval. See Better Shell Integration for the full walkthrough.
The About section shows the app version and a link to display detailed System Information — useful when reporting an issue. Your last-used export folder, file name template, image format, sizes, transparency, and background colour are remembered automatically between sessions.
Supported Formats
Input
CAD Explorer reads AutoCAD DWG and DXF drawings across common versions.
Export
Raster exports cover all image formats registered on your Windows system; the most common are shown below. PDF and SVG are vector formats that stay sharp at any size. A green dot marks formats that support transparency; a blue dot marks vector formats.
* HEIC/HEIF requires the HEIF Image Extensions package from the Microsoft Store, or another codec that registers HEIC/HEIF support. If it's not installed, the format won't appear in the list.
Best for sharing a drawing: use PDF or SVG — both are vector, so the recipient can zoom in without it turning blocky. For raster previews and thumbnails, PNG with Preserve transparency is the safest all-round choice.
File Name Tokens
Customise how exported files are named using these tokens in the File name template field. Tokens are case-insensitive. Write {{ if you need a literal brace.
Example template: {name}_{layout}_{size} produces files like floorplan_Sheet 1_1024.png and floorplan_Model_2048.png. The {size} token is always required; add {layout} whenever you export more than one layout.
Keyboard Shortcuts
Quick actions available in the CAD Explorer app and in the Windows Explorer preview pane.
In the CAD Explorer app
In the Windows Explorer preview pane
Window & navigation
Limitations
CAD Explorer is a fast, accurate viewer and exporter — not a CAD editor. Knowing what it focuses on helps set expectations.
2D rendering
CAD Explorer renders the 2D content of a drawing — the geometry you see in a layout. It is not a 3D viewer: 3D solids and surfaces are not rendered as 3D, and drawings built primarily as 3D models may show little or nothing in a given layout. For 3D work, use a full CAD application. When a layout has no 2D geometry, the viewer shows a "No renderable 2D geometry to display" note, and if the drawing carries an embedded preview image it is a click away on a Preview tab, in both the app and the Explorer preview pane, so you can still see what the drawing looks like.
View & export only
You can open, inspect, and export drawings, but you cannot edit them or save changes back to DWG/DXF. CAD Explorer never modifies your original files.
Fonts & external content
Text is drawn with the fonts available on your system, so unusual or proprietary CAD fonts may be substituted and look slightly different. Content that lives outside the file — external references (xrefs) and externally-linked images — may not appear unless it's embedded or available alongside the drawing. Very new, unusual, or damaged files, and certain custom or proxy object types, may not open or render completely.
High-DPI & scaling: the viewer, preview, and exports use resolution-independent vector rendering, so drawings stay crisp at any zoom and on high-DPI / scaled displays (125%, 150%, 200%, and beyond). Thumbnails and previews are produced at the exact resolution Windows Explorer requests, and exports are pixel-exact at the size you choose.
Tips & Tricks
Exporting every sheet at once
- Open a multi-layout drawing and go to an export page.
- In Settings, set Layout choice for exports to All so every layout is selected.
- Make sure your template includes
{layout}, e.g.{name}_{layout}_{size}. - Click Export — you get one file per layout per size in a single run.
Carrying drawing info into your exports
When exporting to PDF or SVG, turn on Include metadata to embed the drawing's title, author, subject, keywords, and dates. The PDF stores them in standard document properties (visible in Adobe Acrobat and others), and the SVG stores them as Dublin Core metadata (visible in editors such as Inkscape).
Speeding up a folder full of DWGs
If Explorer feels slow generating thumbnails, set the DWG thumbnail mode to Only get thumbnail if available in Settings — it skips rendering and uses each file's embedded preview.
Thumbnails look out of date?
After changing thumbnail settings, click Reset Thumbnails in Settings to make Windows Explorer rebuild its thumbnail cache. You can also clear it with Windows' built-in Disk Cleanup tool: press Win+R, run cleanmgr, tick Thumbnails, and click OK.
"File system error (-2143322102)" when opening a file
If double-clicking a file, or choosing Open with → CAD Explorer, shows a message with the file's path and File system error (-2143322102), your free trial has ended. Windows refuses to start an app whose Store licence is no longer valid, and that number is the Store's licensing error, 0x803F800A, which Windows shows without an explanation. Nothing is wrong with the file.
Get CAD Explorer from the Microsoft Store and the files open again. Until then you can open them with another app, or make another app the default for them in Windows Settings → Apps → Default apps.
Thumbnails or previews don't show (another app is the default)
Windows 10 is the strict case. On Windows 10, whichever app is the default for a type owns its thumbnails and preview outright, so those appear only once you make CAD Explorer the default for the type, or install Better Shell Integration.
Windows lets only one app provide thumbnails and the preview pane for a given file type: the app currently set as the default for that type. If another installed program also handles DWG or DXF drawings and is set as the default, Windows uses its thumbnails and preview instead, so CAD Explorer's may not appear. You have two ways around this: turn on Better Shell Integration, which registers CAD Explorer's handlers with Windows so they show up regardless of the default (a one-time, administrator-approved setup), or set CAD Explorer as the default for the extension with the steps below.
- Open Windows Settings → Apps → Default apps.
- Find and click CAD Explorer in the list (type its name in the search box if needed).
- For each drawing extension (
.dwgand.dxf), click the file type and choose CAD Explorer as the default.
Thumbnails and previews always follow the file type's default app, so this works in reverse too: if you prefer another app for one of the formats, leave it set to that. After changing the default, run Settings → Reset Thumbnails if Explorer still shows old cached thumbnails.
Preview stays blank for files downloaded from the internet
Starting with Windows 11 25H2, Microsoft blocks the File Explorer preview pane for files that carry the "Mark of the Web" — files downloaded from the internet, or coming from a location Windows considers unsecured. This affects every file type, not just DWG/DXF drawings, and it is a Windows security decision: there is nothing CAD Explorer can do at its level to override it.
How to restore the preview: right-click the file → Properties, tick Unblock at the bottom of the General tab, then click OK. To clear many files at once, PowerShell's Unblock-File cmdlet does the same in bulk.
Microsoft has acknowledged this behaviour. For the full explanation and more ways to re-enable previews, see this Windows Latest article — in particular its "How to unblock previews in File Explorer" chapter.
Dark mode
CAD Explorer follows your Windows theme by default. For a fixed look, choose Light or Dark explicitly in Settings.
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