DIAGCAB file icon

DIAGCAB File Extension

Troubleshooting Pack Cabinet Format
  • Developer
  • Category
  • Popularity
    4 (24 votes)

What is DIAGCAB file?

DIAGCAB files contains package of data, typically compressed, used in Windows system troubleshooting. DIAGCAB is a system file used by Windows Vista; on older Windows systems such files were not supported natively. DIAGCAB may be generated with system tools makecab.exe and Cabarc.exe. DIAGCAB file format is used by Microsoft Support Diagnostic Tool, an application available as a part of WTP, a Windows problem diagnostics platform. DIAGCAB can be utilized for identifying and fixing problems and errors in software or drivers and devices used by Windows system. They can also be a part of FixIt solutions.

DIAGCAB can be supplied by various independent hardware manufacturers and dedicated diagnostics software they ship with their product. DIAGCAB are typically digitally signed for authentication and security. Also, such files may be delivered by system administrators. In order to open DIAGCAB file, one must use one of the tools included in Microsoft Support Diagnostic Tool package – msdt.exe. DIAGCAB file runs a Wizzard tool which guides user step-by-step through the system troubleshooting process. Typically, it will also send a report to a website for further analysis and potential solution.

Programs which support DIAGCAB file extension

Programs that can handle DIAGCAB files are as follows. DIAGCAB files can be encountered on all system platforms, including mobile, yet there is no guarantee each will properly support such files.

Programs that support DIAGCAB file

Updated: 05/16/2023

How to open file with DIAGCAB extension?

Being unable to open files with DIAGCAB extension can be have various origins. What is important, all common issues related to files with DIAGCAB extension can be resolved by the users themselves. The process is quick and doesn’t involve an IT expert. We have prepared a listing of which will help you resolve your problems with DIAGCAB files.

Step 1. Install Microsoft Makecab software

Install software to open DIAGCAB file Problems with opening and working with DIAGCAB files are most probably having to do with no proper software compatible with DIAGCAB files being present on your machine. This issue can be addressed by downloading and installing Microsoft Makecab or different compatible program, such as Microsoft Windows. On the top of the page a list that contains all programs grouped based on operating systems supported can be found. One of the most risk-free method of downloading software is using links provided by official distributors. Visit Microsoft Makecab website and download the installer.

Step 2. Verify the you have the latest version of Microsoft Makecab

Update software that support file extension DIAGCABIf you already have Microsoft Makecab installed on your systems and DIAGCAB files are still not opened properly, check if you have the latest version of the software. It may also happen that software creators by updating their applications add compatibility with other, newer file formats. This can be one of the causes why DIAGCAB files are not compatible with Microsoft Makecab. All of the file formats that were handled just fine by the previous versions of given program should be also possible to open using Microsoft Makecab.

Step 3. Set the default application to open DIAGCAB files to Microsoft Makecab

After installing Microsoft Makecab (the most recent version) make sure that it is set as the default application to open DIAGCAB files. The method is quite simple and varies little across operating systems.

Associate software with DIAGCAB file on Windows

The procedure to change the default program in Windows

  • Right-click the DIAGCAB file and choose Open with option
  • Click Choose another app and then select More apps option
  • Finally select Look for another app on this PC, point to the folder where Microsoft Makecab is installed, check the Always use this app to open DIAGCAB files box and conform your selection by clicking OK button
Associate software with DIAGCAB file on Mac

The procedure to change the default program in Mac OS

  • Right-click the DIAGCAB file and select Information
  • Find the Open with option – click the title if its hidden
  • Select the appropriate software and save your settings by clicking Change all
  • Finally, a This change will be applied to all files with DIAGCAB extension message should pop-up. Click Continue button in order to confirm your choice.

Step 4. Ensure that the DIAGCAB file is complete and free of errors

You closely followed the steps listed in points 1-3, but the problem is still present? You should check whether the file is a proper DIAGCAB file. Problems with opening the file may arise due to various reasons.

Check DIAGCAB file for viruses
1. The DIAGCAB may be infected with malware – make sure to scan it with an antivirus tool.

If the file is infected, the malware that resides in the DIAGCAB file hinders attempts to open it. Scan the DIAGCAB file as well as your computer for malware or viruses. If the scanner detected that the DIAGCAB file is unsafe, proceed as instructed by the antivirus program to neutralize the threat.

2. Verify that the DIAGCAB file’s structure is intact

If you obtained the problematic DIAGCAB file from a third party, ask them to supply you with another copy. It is possible that the file has not been properly copied to a data storage and is incomplete and therefore cannot be opened. When downloading the file with DIAGCAB extension from the internet an error may occurred resulting in incomplete file. Try downloading the file again.

3. Ensure that you have appropriate access rights

There is a possibility that the file in question can only be accessed by users with sufficient system privileges. Log out of your current account and log in to an account with sufficient access privileges. Then open the Troubleshooting Pack Cabinet Format file.

4. Check whether your system can handle Microsoft Makecab

The operating systems may note enough free resources to run the application that support DIAGCAB files. Close all running programs and try opening the DIAGCAB file.

5. Ensure that you have the latest drivers and system updates and patches installed

Regularly updated system, drivers, and programs keep your computer secure. This may also prevent problems with Troubleshooting Pack Cabinet Format files. Outdated drivers or software may have caused the inability to use a peripheral device needed to handle DIAGCAB files.

Do you want to help?

If you have additional information about the DIAGCAB file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on DIAGCAB file.

Top File Extensions
Show more
File Extension of the day
lvf icon


Logitech Video Effects Format

LVF files store effects settings for Logitech Webcam Software, which allows user to add various visual effects during video chat sessions. LVF file...

Last updated