Help & Manual version 3 help project
File type: Document file
A hm3 file is a Help & Manual help project file created with version 3 of the software.
It contains the editable source for a documentation or help project rather than a published help file.
File type category:
Document file
Date updated: October 11, 2026
The hm3 file extension is associated with Help & Manual, a documentation authoring and content management tool from EC Software.
An hm3 file stores the source content and project settings used to create a help system or other documentation output. It belongs to the project rather than being a standalone document for end users.
This is a legacy project format associated with Help & Manual version 3. Help & Manual is available for Microsoft Windows, and support for older projects can depend on the software version used.
Open the hm3 file in Help & Manual on Microsoft Windows. Use version 3 or another version that supports this legacy project format.
If an installed version does not recognize the project, open it with a compatible older release of Help & Manual.
Open the hm3 file in a compatible version of Help & Manual and use its publishing or export functions, where available, to create supported documentation output.
Exporting creates published files and does not necessarily convert the project into a newer editable Help & Manual project format.
Software applications that can open hm3 files:
Microsoft Windows
Software applications that can edit hm3 files:
Microsoft Windows
Software capable of saving hm3 files:
Microsoft Windows
Software apps that create hm3 files:
Microsoft Windows
Language
