.CGM file extension
To open .CGM files on Windows, right-click the .cgm file and choose open with..
.CGM files are typically opened with software that supports CGM Image File. Use CAD viewers/editors that support this design format. Avoid renaming the extension directly, because renaming does not convert the actual file format.
Open on your device
Choose your operating system for a dedicated step-by-step opening guide.
How to open .CGM files
Use these platform-specific instructions to open .CGM files safely.
Windows
- Right-click the .CGM file and choose Open with.
- Select a trusted Windows app that supports .CGM files.
Mac
- Control-click the .CGM file and choose Open With.
- Pick a compatible Mac application to open the file.
Linux
- Open the .CGM file from your file manager with Open With.
- Choose an installed Linux app that supports this format.
iOS
- Open the .CGM file from Files and tap Share.
- Send it to a compatible iOS app if Quick Look cannot preview it.
Android
- Open the .CGM file from Files or Downloads.
- Choose a trusted Android app that supports the format.
Can't open this file?
These are the most common causes and fixes when .CGM files fail to open.
Common reasons
- .CGM file does not open
Fix steps
- Install or update a compatible application.
- Verify the file came from a trusted source and was fully downloaded.
- Try opening the file in an alternative app on another platform.
OS-specific troubleshooting
What is a .CGM file?
.CGM is a CGM Image File format used for technical drawings, engineering design, and manufacturing workflows. CAD files can include geometry, layers, measurements, and annotation metadata. Common MIME type: image/cgm. If the file does not open, check that you are using a compatible app and a complete, trusted file source.
Common MIME types: image/cgm
Common .CGM issues
.CGM file does not open
This usually means the required app is missing or the .CGM file is incomplete.
- Install or update a compatible application.
- Verify the file came from a trusted source and was fully downloaded.
- Try opening the file in an alternative app on another platform.
Security notes
- Only open .CGM files from trusted senders.
- Scan downloaded files before opening them.
- Avoid running embedded scripts or macros unless you trust the source.
FAQ
Can I convert a file by renaming it to .CGM?
No. Renaming changes only the suffix. Use a proper conversion tool or export function.
Is .CGM safe to open?
It can be safe when the file comes from a trusted source and is opened in reputable software.
Similar file extensions
Compare related formats in the same category to find the right tool faster.