Registering file associations is platform-dependent, so it would be nice if Velopack could handle this.

There should be support in VelopackApp for handling a triggered association, eg.

VelopackApp.Build().OnFileAssociation((ext) => { ... }).Run()

There should be support in the command line tool to provide a list of associations to register, eg.

vpk pack ... --fileAssoc pdb,ext

On MacOS, we only need to write this to the Info.plist, so it will be very easy. On Windows, we'll need to write the associations to the nuspec, and handle registry modifications in the install/update/uninstall. If the associations have changed or added from one version to another they will need to be updated.