Hi Ahmed,
First of all the job server should support any of the file compression methods like(7z,gzip,zip).
If it is available use exec function in script to call a batch/to uncompress the 7z file.
for eg in windows: exec('cmd','"\Program Files\7-Zip\7z.exe" e "C:\Desktop\ee.7z"',8)
for ref for 7zip extract:
http://sevenzip.sourceforge.jp/chm/cmdline/commands/extract.htm
Thanks,
Ancy