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?

DIAGCAB files are Diagnostic Cabinet files, which you can read more about below.

The DIAGCAB file extension indicates to your device which app can open the file. However, different apps may use the same file extension for different types of data. So a DIAGCAB opener may not be able to open all kinds of DIAGCAB files. In this case, though, we only know of one specific use.

Diagnostic Cabinet

Microsoft developed the DIAGCAB file format as a data and archive file format for Windows Vista, 7, 8, and 10. These .diagcab files are generated by the makecab tool, a Windows application built into these Windows OS versions. The data stored in a DIAGCAB file can be viewed 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 were 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.

We have not verified any programs yet that works with this specific format. If you know any, please use the 'Suggest a program' link below. Thanks!

DIAGCAB file openers, viewers, etc.

These apps are known to open certain types of DIAGCAB files. Remember, different programs may use DIAGCAB files for different purposes, so you may need to try out a few of them to be able to open your specific 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!