How to have Windows 10 open VMOD files as if they were ZIP files

By default VMOD (module) files are sent to Vassal to open. But if you would like to have Windows treat VMOD files as if they were ZIP files (so that double-clicking them opens them like a directory, and you can insert/remove components directly without renaming them to ZIP’s), do the following:

  • Right click “Start” button in lower right
  • Select “Command Prompt (Admin)”
  • On the command line, type:

assoc .vmod=CompressedFolder

  • Open Windows’ File Explorer (can click Start button and start typing “File Explorer” to find it)
  • Browse to any .vmod file you have
  • Right-click the file
  • Select “Open with…” from the right-click menu
  • Select “Choose another app”
  • Select “File Explorer” and check the “Always open with this app” checkbox.
  • You should be good to go! Windows will now “browse into” VMOD module file contents when you double-click on one, instead of opening the module in VASSAL.

NOTE - this means that to open vassal modules to play them, you will need to launch Vassal and open them there (double clicking them now opens them as if they were zip files, instead of launching Vassal).

NOTE - You will have to repeat this procedure after you install a new version of VASSAL, if the installer updates the file associations.