Have you tried extracting with a different program? There are several free ones you can try.

Sometimes one will work better than another.

If that doesn’t work, you could see if there is anything amiss with your file copies.

The best way to do that is to verify the checksums of the file. See how to do that in Windows here or on a Mac here

It basically generates an ID number that will be drastically different if any part of the file is different, say from a download glitch or a disc error.

I can send you what the numbers for the checksums for SW part 47 & SW Docs part 29 should be.

If you perform a checksum varification on the files you have and the numbers I send you don’t match exactly what you get when you run the check on your file copies, we’ll know you have corrupted copies and take further steps to correct that problem.

Let me know if you want me to send you the checksums, or if trying a different extractor fixes it.