sacal:
open x-term an type:

- compress a folder:
tar -czvf test.tar.gz any_folder_here (this will create a tar.gz file)
tar -cjvf test.tar.bz2 any_folder_here (this will create a tar.bz2 file)
zip test.zip any_folder_here (this will create a zip file)

- decompress:
tar -xvf test.tar.gz
tar Fxf test.tar.bz2
unzip -o test.zip

tell me how those commands work.

FileBox uses the same commands with differents arguments maybe, but not uses own compressors/decompressors.
If they work then tell me what are you trying to compress or decompress