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Any file or folder with the names 'a' or 'ab' on my computer instantly get hidden. I've enabled viewing hidden files and folders, and I'm also able to view superhidden system files. However these a and ab folders are not visible unless I view them from a linux boot disk, safe mode, and powertool x64 is also actually able to see them. This phenomenon is preventing me from installing a game (Aion) because the installer needs to create a folder called 'ab' for textures, but upon doing so it is instantly hidden and that throws the installer an error.