I had exactly the same suspicions about albumwrap with an awful lot of them, until I hit a genuine one. I was over the moon to actually find one

For Mac there is an application called File juicer which extracts almost anything from a file and this includes files that albumwrap extractor will not. I am sure there must be a Windows equivalent of File Juicer, but I'm not sure what.

btw I am really OAH but the forums have been a bit strange recently