.hmxp file: how to open it on Windows

2 Windows apps register the .hmxp extension. Install one of them to open the file with a double-click.

• H
  Help+Manual 10

  Windows help and documentation tool

  Proprietary 10.1.0
• H
  Help+Manual 9

  Windows help and documentation tool

  Proprietary 9.7.2

Related guide: Change the default app for a file type in Windows