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HM3 File - What is an .hm3 file and how do I open it?

Learn about .HM3 files and view a list of programs that open them.

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Overview

What is an HM3 file? An HM3 file is a project created by version 3 of EC Software Help & Manual, a Windows-based software tool for creating user documentation. It contains help pages saved in Rich Text Format ( RTF ) and stores information about the structure and content of a help project, including topics, text formatting, and project settings.

More Information Help & Manual was designed to make it easier for developers and technical writers to create consistent, structured documentation across multiple platforms. Users can create help pages and save them as HM3 projects to preserve their progress, and then export them to several different help formats, including WinHelp ( .HLP ), HTML Help ( .CHM ), WebHelp, and .PDF . NOTE: EC Software released version 3 of Help & Manual in the early 2000s, and later versions of the software replaced HM3 files with the .HMX and .HMXZ formats, which offered improved XML-based data structures and additional features.

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.HM3 File Extension

Help & Manual 3 Project

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What is an HM3 file?

An HM3 file is a project created by version 3 of EC Software Help & Manual, a Windows-based software tool for creating user documentation. It contains help pages saved in Rich Text Format ( RTF ) and stores information about the structure and content of a help project, including topics, text formatting, and project settings.

More Information

Help & Manual was designed to make it easier for developers and technical writers to create consistent, structured documentation across multiple platforms. Users can create help pages and save them as HM3 projects to preserve their progress, and then export them to several different help formats, including WinHelp ( .HLP ), HTML Help ( .CHM ), WebHelp, and .PDF .

NOTE: EC Software released version 3 of Help & Manual in the early 2000s, and later versions of the software replaced HM3 files with the .HMX and .HMXZ formats, which offered improved XML-based data structures and additional features.

How to open an HM3 file

You can open HM3 files with EC Software Help & Manual in Windows. However, the software is discontinued.

How to convert an HM3 file

EC Software Help & Manual in Windows can convert HM3 files to the following formats:

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Programs that open HM3 files

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Updated: April 18, 2025

FAQ

What is an HM3 file?↓
An HM3 file is a project created by version 3 of EC Software Help & Manual, a Windows-based software tool for creating user documentation. It contains help pages saved in Rich Text Format (RTF) and stores information about the structure and content of a help project, including topics, text formatting, and project settings.
How do I open an .hm3 file?↓
You can open HM3 files with EC Software Help & Manual in Windows. However, the software is discontinued.
How do I convert an .hm3 file?↓
EC Software Help & Manual in Windows can convert HM3 files to the following formats:

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