A daily updated filename extension database!

HXD file extension

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

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

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

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

✅ Microsoft Help 2 Validator Data

HXD file is a Microsoft Help 2 Validator Data. The Microsoft Help is a Microsoft proprietary online help file format.
HXD format description not yet available
Category: Data files
Application: Microsoft Help
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
HXD aliases:
HXD related links:
HXD related extensions:
Microsoft Help 2 HxMerge Project

Microsoft Help 2 Merged Index

Microsoft Help 2 Merged TOC

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

🚫 The .hxd file extension is often given incorrectly!

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

bxd, gxd, had, hcd, hd, hdd, hdx, hsd, hx, hxc, hxe, hxf, hxr, hxs, hxv

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

The Dark Mod eXternal Data
HotDisc Designer Document
General Hard Disk Image
Microsoft Help 2 Combined Attribute Index
Sony Playstation 2 SCEI Instrument Set Data
Broken X Disk Manager Database
Microsoft Help 2 Merged Index
MS Help 2 Project Sample Definition
Highway Pursuit Game Data
Genomatix Tuxedo Framework Data

🔴 Can't open a .hxd 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 .hxd 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 .hxd file extension, write to us!

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