A daily updated filename extension database!

HM file extension

The table below provides useful information about the .hm file extension. It answers questions such as:

  • What is the .hm file?
  • What program do I need to open a .hm file?
  • How can the .hm file be opened, edited or printed?
  • How can I convert .hm files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ WinHelp Context ID

HM file is a Windows Help Context ID. Microsoft WinHelp is a proprietary format for online help files that can be displayed by the Microsoft Help browser winhelp.exe or winhlp32.exe. The file format is based on Rich Text Format (RTF). It remained a popular Help platform from Windows 3.0 platform through Windows XP. WinHelp was removed in Windows Vista to discourage software developers from using the obsolete format and encourage use of newer help formats.
Application: Visual Studio
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
HM aliases:
HM related links:
HM related extensions:
Windows Help File

HTML Help Project

Windows Help Project

HTML Help Header File

Windows Help Related Data

Other types of files may also use the .hm file extension.

🚫 The .hm file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

bm, gm, hh, hj, hk, hl, jm, mh, mm, nm, tm, um, ym

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

RM Number Magic Document
TeXmacs Document
jMusic Music Score
Catalyst Translation Memory Data
Commodore 128 VDC BitMap Image
Autologic Bitmap Image
C++ Header File
HTML Help Header File
Teli Fax Image
Habanero-Java Source Code

🔴 Can't open a .hm file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .hm file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .hm file extension, write to us!

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Browser: Abbreviation Application Archive Audio Configuration Data Development Disk Image Document Ebook Font Game Data GIS Graphic Malware Multimedia Other Project Scam Unknown Video
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