How to open DIAGCAB files

Did your computer fail to open a DIAGCAB file? We explain what DIAGCAB files are and recommend software that we know can open or convert your files.

What is a DIAGCAB file?

The DIAGCAB file format was developed by Microsoft as a data and archive file format for Windows Vista, 7, 8 and 10. These .diagcab files are generated by the makecab tool, which is a Windows application that's built into these Windows OS versions. The data stored in a DIAGCAB file can be viewed by using the Microsoft Support Diagnostic Tool, which is another application that's also available in these Windows OS versions.The Windows Troubleshooting service uses these .diagcab files, which was introduced in Windows Vista. This application assists users in detecting problems and repairing system issues. This can also be used to send error logs and reports to Microsoft servers for analysis.Similar to a CAB file, a .diagcab file may contain multiple resources and multimedia content items. It's best to leave these DIAGCAB files alone, in order to ensure that the Windows Troubleshooting service and the Microsoft Support Diagnostic Tool can properly access the resources and data stored in these .diagcab files when needed.

Software that will open, convert or fix DIAGCAB files

These apps are known to open certain types of DIAGCAB files. Since many different programs may use DIAGCAB files for different purposes, you may need to try a few of the apps to open your specific DIAGCAB file.

Free File ViewerFree File ViewerUser submitted
Ultra File OpenerUltra File OpenerUser submitted
We have not verified any programs that we know for certain can work with DIAGCAB-files on Mac. If you know one, please use the Suggest link below and tell us about it!
We have not verified any online services that we know for certain can work with DIAGCAB-files. If you know one, please use the Suggest link below and tell us about it!