tempGBA - corrupt exe file

[LunaMoo]

It's fake signed.

That forever will be a problem on emulators(including sony's official emulators on ps3/psv) since the key people fake sign homebrew is from one of the japanese demos like loco roco which can't be decrypted outside of real psp due to missing kirk key.
If you want to use such homebrew you will either have to download a non signed version / compile it yourself and avoid the awful fake signing or decrypt the executable file using real psp with some decrypting homebrew. You can't decrypt it on any emulator and that's exactly why it appears corrupted.