Are you using the latest version of the SLK 1.3.1? Or are you running the old MLG version of the SLK? There are known issues with the old version of the SLK and the zip function.
You can use THESIS to convert any file that can be presented in a browser - PPT, Word, PDF's HTML, videos, MP3 etc.
If you update using the tools to SLK1.3.1 you should be able to address the zip issue and then you can use tools like the THESIS tool to build questions etc., now that has been updated to support 8 different question types.
Hope this helps