If you install a 64-bit version of wine (using a 64-bit package or compiling it as a 64-bit program), you then need to generate a 64-bit prefix for your application. Depending on your setup, the default may be 32-bit or 64-bit. To do this, you need to either delete/recreate your current wine prefix for that app, or create a new one by a different name. In either case, use this command:
Code:
WINEPREFIX="/home/user/whateveryouwant" WINEARCH=win64 wine 64bitprogram.exe
Depending on your setup, you may need to replace "wine" with "wine64"--but I think that's now deprecated. Each time you run the program, you'll need to use that same command. If the program is an installer, then you'll need to replace "64bitprogram.exe" with the path to the executable it installed. Remember to use all caps for the WINEPREFIX and WINEARCH variables.
Hope that helps.
--Dane
P.S. Cool signature. :-)