I'm having a bit of trouble getting WinMerge to accept command line arguments, although it does seem to run nicely under wine. I am using Wine under Mac OSX. From selecting files manually within WinMerge, I can see that it uses a Z: drive letter to reference the OS filesystem. I have tried this: Code: open -a Wine "/Applications/WinXP/drive_c/Program Files/WinMerge/WinMergeU.exe Z:\Users\usera Z:\Users\userb" and this: Code: open -a Wine "/Applications/WinXP/drive_c/Program Files/WinMerge/WinMergeU.exe -- Z:\Users\usera Z:\Users\userb" with no luck so far. Can anyone offer some advice? I'm not a stranger to the command line, but I am new to wine.