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Thanks for the reply. Taking ownership wasn't enough, but after I gave my account "Full control" over the file I successfully deleted it. I had created a backup copy of it before starting to change ownership and permissions but I didn't think to compare the unmodified original with the copy to see whether ownership and permissions were changed in the copy or not. I like your modification very much.

I registered an account just to be able to download your alt tab modification, having tried and disliked "Alt Tab Tuner VIII" and "VistaSwitcher" previously. I tried both installation ways described in your "readme.txt", none worked. The File Explorer way outputs "You require permission from TrustedInstaller to make changes to this file". The Command Prompt way outputs "Access is denied." Help would be appreciated.