What version of App Virt are you using? I did a quick test in 3.387 by opening the cmd.exe shortcut I created with the main package and ran "dir > %computername%.txt" and it properly created the file with the real computername. If you can do the same thing with whatever version you are using, it may be that it isn't processing variables in the package.ini.
I'll look into this a bit more if I get a free minute today.
Same results in 3.300 and 3.387
What happens if you try this
CommandLine=cmd.exe /c "%ProgramFilesDir%\DLC101A\bin\prowin32.exe" -p
Hey! it worked with the cmd first.
Still seems like a bug tho.
Thanks for the help!