I don't why you think the file name has anything to do with it being 32 or 64 bit. Both are x86 architectures. However, after checking the file properties on the MS website, it IS a 32bit version, so that's not the issue. I'd try a different file compression utility or download the file again. It's not uncommon for downloads to sometimes be incomplete or otherwise corrupted during the download process.
The 7zip might even be at fault. Some compressed files that are in .exe format won't even allow unpacking and you have to simply click and run the package which should have it's own unpacking mechanism anyhow. That's what I'd try first as Microsoft isn't known for distributing files that require third party utilities, it's counter productive to require users to use utilities from OTHER software vendors.
Considering those are likely .cab files and windows has supported both .zip and many other compressed file formats natively since windows Vista, it's doubtful that you should need ANY utility to unpack that bundle.