C:\Program Files (x86)\Red Storm Entertainment\RavenShield\system
By holding Shift + right click mouse in empty area of system folder and select Open Command Window here on menu.
UCC.EXE COMPRESS MYMAP.RSM
Your compressed file has been Renamed to MYMAP.RSM.UZ and will be in the system folder
Place the file that you want to compress in the system folder
Check spelling on compression command
UCC.EXE COMPRESS YOURFILE.RSM
UCC.EXE COMPRESS YOURFILE.USX