[bizniz]

put rar.exe in ioftpd system dir (with ioftpd.exe)

then you can just do:

site exec rar.exe -m5 files.rar your.file

or put an itcl on scheduler:

catch {exec -- c:/ioftpd/ioftpd/scripts/rar.exe -m5 filename.rar your.file}

or whatever..