Help Unpack *.mrs

When I run unpack, It only appear words "Can't open input file". How can I fix ?

But your files the mrs.exe and zlib.dll or what it was and also the mrs file u want to unpack in C:\Documents and Settings\<user>
then go to start and hit the run button...and type there cmd
now in cmd type(i will take system.mrs) mrs.exe d system.mrs and hit enter
to repack type mrs.exe c (folder name and dont use .mrs in the end)....mrs.exe c system.