Converting a .zip file into a .sx2 file
Some Singles 2 games doesn't seems to work well with .sx2 file in the "Extentions" sub folder. Others seems to accept only .zip files (yes, Singles 2 works with .zip files). If you're having problems seeing the add-ons you put in the "extensions" folder, maybe this is your solutions.
I'm using Winrar here but I imagine that Winzip should work the same. I'm using the "Shirtsammlung" add-on for that example.
-Extract your .zip file on your desktop by using Extract the files ...
-Open the folder Shirtsammlung
-Select all the files.
-Right-Click on any of those files and choose "add to archive..."
Next….
Rename the end of your .zip file in .sx2
Click OK, a .sx2 will be create.
Cut/Paste only this .sx2 file into your "Extensions" sub folder.
Close everything, open the game and try it out.
Read also : Converting a .sx2 file in to a .zip file