config.dat editing

[momo0000]

how to edit this file config.dat
i try to edit it with biggui
but i got this message invalid header
and file master and cm07 too but cant's edit it
what should i do to open and edit config.dat

 

[Dmitri]

The file is compressed. You need to uncompress the file first.

 

[momo0000]

The file is compressed. You need to uncompress the file first.

can you show me how to decompress this file ?
Because I tried several programs and the decompression did not work