Click on "Paks folder" to choose the folder (in game folder) where is stored all Pak/Patch files.

Click on "Destination" to choose the folder where all files will be uncompressed. A "data" folder will be created with all tree-like aspect of game there.

Click on "Uncompress" to throw the uncompression of all files

Cities Xl reads compressed files in this order:

1 - PAKS files in alphabetical order.
2 - PATCH files in alphabetical order.

When there is a game update, it is Patch files which are added in the PAKS flder.
Idem with the mods which are Patch files.
In a Patch file, there are altered versions of the original files (in PAKS files) and sometimes new files which are not present in Paks files are added.
In fact Cities XL replaces according to decompression the files of the same name!

This software works similarly! Reading and decompression of Paks files then Patch files.

If you uncompress complete game, make sure to take your mods away provisionally if you have it to be sure to have all original files (of the last update).

If you uncompress another folder, do not forget to take into account the order of file reading!

Notice about folder structure :

When you will make mods, especially do not forget that your altered files will owe beings put in a "data" folder with inside the original folder and sub-folders structure.