Haha sounds like you’ve done exactly what this person did in the thread I linked earlier:
You will need to decompress the file. You can do that on your computer using something like winrar.
You can do if on the gameshell too, but that would require some use of a command line interface.
See how you go after decompressing the files.
If it still doesn’t work, let me know what the format of the decompressed files are and we’ll go from there.
The reason you can’t see any files scanning through via the launcher is that the PlayStation folder is instructed to only identify file types it can run.
If you scan through using the built in file browser in utilities, you should see your files. So don’t panic. They’re there, just not in a state you can use them yet.