MS_ File Extension

Microsoft Windows Winhelp Compressed

File Type ms_
Developer Microsoft Corporation
Popularity
4.2 (37 votes)
Application Microsoft Windows Help
Category Compressed Files

What is a MS_ file?

Files with the MS_ extension are specifically tied to Microsoft Windows Winhelp Compressed, a Compressed Files type, and there are 820 files in this category.

The Microsoft Windows Winhelp Compressed (MS_) was developed by Microsoft, which created file format and 242 programs to work with them.

MS_ file support extends to various operating systems, including Windows. To open a MS_ file, you can choose from 2 programs such as Microsoft Windows Help and Microsoft Windows.

Programs that support MS_ files

Windows ²

Windows

How to open a MS_ file?

If you cannot open a MS_ file, it is most often due to missing software. Select a program from the list according to your operating system. Then go to the official website of the program developer, download it, and install it on your device.

Thanks to their popularity, Microsoft Windows Help and Microsoft Windows are often the go-to programs for managing MS_ files. If you need the newest version of Microsoft Windows Help, just access the Microsoft website. From there you can download the installer compatible with all systems.

Once Microsoft Windows Help is installed, the OS should configure it as the default tool for opening MS_ files.

Make Microsoft Windows Help the default MS_ viewer

Change the default app to open files on Mac

Right click or use Control + Left Click on the desired MS_ file to access a dropdown menu of actions;
Choose "Open in Application" and click "Other";
Towards the bottom of the window, find the "Enable" menu, which is already set to the default option, "Recommended Programs";
In this menu, select "All Programs" and search for Microsoft Windows Help. Check the box next to "Always open in app" to make it the default option.

Change a default app in Windows

Start by right-clicking on your MS_ file, then select the "Open with" option and choose "Choose another app" from the menu that appears;
Inside the popup window, scroll through the list of applications and specifically choose Microsoft Windows Help as the application to associate with your MS_ file;
Check the "Always use this app" checkbox and click "OK".

Finding answers to MS_ file problems

If MS_ files are giving you trouble, small modifications to your software can help. Check out the troubleshooting tips below to fix these issues.

What can lead to sudden Microsoft Windows Help crashes?

Insufficient updates for Microsoft products can cause Microsoft Windows Help to crash. Be sure to regularly install the latest software updates.

A computer restart is often the key to solving numerous common problems. That’s why, it is recommended to restart the computer before making any changes to the software settings.

What is the recommended approach to repair a damaged MS_ file?

Use a recovery program to open the damaged MS_ file, and in the menu, click "Repair" to start the repair operation. Wait for the recovery process to finish as it will automatically restore the damaged compressed files.

What are the ways to check if my MS_ file is damaged?

Characteristics of corrupted MS_ compressed files can include:

The file encounters problems during the opening process or shows error indications;
Editing the archive in Microsoft Windows Help is hampered by poor overall performance;
The file causes Microsoft Windows Help or other software to hang or crash during various operations;
An unexplained increase in the size of the MS_ file;
Actions performed on the file result in the appearance of error notifications;

How to edit a MS_ file?

To modify MS_ files, you need to install special software that makes it possible to open and edit compressed files. Online MS_ editors are more restricted compared to software designed for Microsoft Windows Winhelp Compressed.

Best MS_ editors 2026

According to these factors, we have compiled a list of available MS_ editors.

MS_ Editor Software	Developer	Platforms	Overall Rating
Microsoft Windows Help	Microsoft	Windows	4.2 out of 5 (38 reviews)

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