W Walford

Hello, I created a new archive from the 7-zip app and added an mp3 while selecting 7-zip password-protection on compression. Then I dragged and dropped other mp3s into the archive, while open in the app, from other windows folders. Afterwards, if I go into the archive in file explorer, the first mp3 does not open because it is encrypted, but all the other mp3s do open. If I do the exact same thing with pdfs, all of the pdfs will be encrypted. It therefore seems to be a problem with mp3 files. I am...