Dear Ryan Woodsmall: Thank you for the tip. Does the call to: wine winecfg then need to be run each time that a new WINE session is initiated to run my Windows program? I guess in the case that the wine configuration files are already present it will just not write them again I suppose. This should work just fine for me as the application is launched with a Bourne shell script. Setting the WINEPREFIX for each program call is thus very easy. Thanks, Thomas