A daily updated filename extension database!

H1D file extension

The table below provides useful information about the .h1d file extension. It answers questions such as:

  • What is the .h1d file?
  • What program do I need to open a .h1d file?
  • How can the .h1d file be opened, edited or printed?
  • How can I convert .h1d 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

✅ Microsoft Help Validator File

H1D file is a Microsoft Help Validator File.
Category: Data files
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
H1D aliases:
H1D related links:
H1D related extensions:
Windows Help File

Windows Help Project

Microsoft Help Collection Definition

Microsoft Help Topic Definition

Microsoft Help Keywords Index

Microsoft Help VTopic Definition

Microsoft Help Compiled Help Data

Windows Help Project

Microsoft Help Merged Hierarchy File

Microsoft Help Merged Query Index

Other types of files may also use the .h1d file extension.

🚫 The .h1d file extension is often given incorrectly!

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

h1c, h1s, h1v, h1w, hd, hld, hwd

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Sony Playstation 2 SCEI Instrument Set Data
Microsoft Help Collection Definition
Hedgewars Demo
Microsoft Help Compiled Help Data
General Hard Disk Image
Microsoft Help VTopic Definition
Microsoft Help Merged Keyword Index
Structural Desktop Hold Data

🔴 Can't open a .h1d 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 .h1d 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 .h1d file extension, write to us!

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