compress method proplem

[medoman]

hi all

i have a compressor that compress files with this method

a -ep1 -r -ed -lc510 -ld553 -mt8 -mprecomp+srep64+delta+lzma64:a1:mfbt4:d158m:fb273: mc1000:lc8

who can i make my installer setup decompress this files

[medoman]

http://pastebin.com/871t2cY6

this is the script