File Extension Search

.diagcab File Extension

Developer: Microsoft
File type: Troubleshooting Pack Cabinet File
You're here because you have a file that has a file extension ending in .diagcab. Files with the file extension .diagcab can only be launched by certain applications. It's possible that .diagcab files are data files rather than documents or media, which means they're not meant to be viewed at all.

what is a .diagcab file?

The WTP Wizard software, also known as the Microsoft Support Diagnostic Tool, accesses the data stored in a troubleshooting pack cabinet File for some of its troubleshooting functionalities. A troubleshooting pack cabinet File is stored in the DIAGCAB format, and this file format is classified as a system file developed by Microsoft. The WTP Wizard and these DIAGCAB files are used by the Microsoft Windows OS for troubleshooting and resolving issues related to hardware resources connected to the computer as well as to installed software resources that have encountered freezes and crashes among other initialization and performance problems. Legitimate files appended with the .diagcab extension that are posted for download are implemented with digital signatures so users can ensure the authenticity of the DIAGCAB file, and each DIAGCAB file is associated to a hardware issue or a software problem that has been resolved by the WTP Wizard application. OEMs (Original Equipment Manufacturers) deploy these DIAGCAB files to provide technical support to users of their hardware devices. Independent Software Vendors (ISVs) can also offer these DIAGCAB files for troubleshooting known issues of their custom software products developed for computers running on Microsoft Windows-based systems.

how to open a .diagcab file?

Launch a .diagcab file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .diagcab file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .diagcab files aren't yet associated with it. In this case, when you try to open a .diagcab file, you can tell Windows which application is the correct one for that file. From then on, opening a  .diagcab file will open the correct application. Click here to fix .diagcab file association errors

applications that open a .diagcab file

Microsoft Support Diagnostic Tool

Microsoft Support Diagnostic Tool

Microsoft Support Diagnostic Tool or the so called WTP Wizard software collects data that can be used by Microsoft Support for troubleshooting your computer problem, an ActiveX Control that can enhance user’s support experience and make it easier for the user to submit a support incident. It also gathers diagnostic information, such as system information, registry settings, files, and similar data from your computer and uploads this information to the support engineer over a secure channel. This information can be utilized to analyze the problem that the users are having on your computer. To gather this system information, the Microsoft Support Diagnostic Tool downloads tools onto your computer if they do not already exist. A troubleshooting set cabinet file is saved in the DIAGCAB format, and this file format is categorized as a system file developed by Microsoft. The WTP Wizard and these DIAGCAB files are utilized by the Microsoft Windows OS for troubleshooting and resolving issues associated to hardware resources connected to the computer as well as to installed software resources that have came across freezes and crashes among other initialization and performance problems.
Microsoft Sign Tool

Microsoft Sign Tool

SignTool is a command-line tool that digitally signs files, verifies signatures in files, and time-stamps files. This tool is directly installed with Visual Studio and with the Windows SDK. To run the tool, it is suggested that user must utilize the Visual Studio Command Prompt or the Windows SDK Command Prompt (CMD Shell). These utilities enable the users to run the tool easily, without navigating to the installation folder. SignTool returns command line text that states the result of the signing operation. Moreover, it returns an exit code of zero for successful execution, one for failed execution, and two for execution that completed with warnings. Examples of SignTools are (1) catdb - configures SignTool to update a catalog database, (2) sign - configures SignTool to digitally-sign the files whose names are specified by the File Name argument, (3) /d - configures SignTool to update the catalog database. If neither /d nor /g switch is used, SignTool updates the system component and the driver database, etc.

a word of warning

Be careful not to rename the extension on .diagcab files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

what is a file extension?

A file extension is the set of three or four characters at the end of a filename; in this case, .diagcab. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.

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