extension issues

About this tag
This tag covers discussions about reassigning file extensions to different applications in Windows, especially when the original program is no longer present. Users share troubleshooting steps for changing default programs for file types like .avi, addressing issues where the old application has been deleted or moved. The content focuses on manual methods to edit file associations through registry or system settings, with an emphasis on portable applications and scenarios where standard 'Open with' options fail. Common themes include persistence of broken associations and workarounds for stubborn file type assignments.
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    Windows 7 How to really, really re-assign file extensions to new application?

    At first an important request: Please read my problem carefully. The solution is not as easy at it seems to be at the first glance! Since WinXP I have a problem when I want to re-assign a file extension to another application (=the program which should be used when double clicking on a certain...