Using Windows Environment Variables

Can I use windows environment variables in the Opus command functions ? For example;

Instead of "c:\Program Files"
Can I have something like "%SystemDrive%:\Program Files" ?

I tried, it didn't work.

I have 2 windows installed into 2 partitions. The roots are C:\ and E:. When I create an Opus command, I would like to use environment variables, so that the same command can be port to either OS, and without having to change the drive letter of the command.

There's already a : in %SystemDrive% so your %SystemDrive%:\Program Files will be turning into C::\Program Files which is obviously wrong.

By the way, if you want the button to be even more correct you should use the %ProgramFiles% env-var, or Opus's /programfiles alias, since the program files directory may have a completely different name/location on some machines.