I first installed kchmviewer. I then created the file run_prog: #!/bin/sh $1 "`wine winepath -u "$2"`" I tested by running from a terminal run_prog kchmviewer c:\MyChmFile.chm This worked fine I edited the registry entry for chm.file to /usr/bin/run_prog kchmviewer %1 > > Note: > While researching regedit I noticed the reference to wineprefixcreate at: > http://wiki.winehq.org/UsefulRegistryKeys > > Do you now call wineboot to update? > A windows program using ShellExecute with "open" on c:\MyChmFile.chm appears to still call HH.EXE Is it possible to override wine using HH.EXE? Last tested on clean install of rc2 James