It screws your app files.

I dont know if its just me but after I installed Alzip, a lot of uncompressed .app files by Alzip wont open.
Also some .app files would not open just because Alzip is installed on this computer.
After I unintalled Alzip, all .app files open up without a problem.
If you want more trouble in your life, install this.

xCatalystx about ALZip