Cant get inno setup to decompress archive during installation!

[Razor12911]

arc.ini must be like this

[External compressor:srep]
header = 0
packcmd   = srep {options} -m3f -a2 $$arcdatafile$$.tmp $$arcpackedfile$$.tmp
unpackcmd = srep {options} -d -s - - <stdin> <stdout>

include arc.ini in [Files]
extract file during installation.

done!

[surumanboy]

in arc.ini i have

[External compressor:srep]
header = 0
packcmd = srep {options} -m3f -a2 $$arcdatafile$$.tmp $$arcpackedfile$$.tmp
unpackcmd = srep {options} -d -s - - <stdin> <stdout>




in files section in script

Source: arc.ini; DestDir: {tmp}; Flags: dontcopy


same problem