Changing a file’s extension: disabling the “If you change a file name extension, the file may become unusable…” warning

Are you sure you want to change it?

Yes, I’m quite sure I want to change it and I don’t want to be prompted.

This posting suggests that to disable this annoying dialog, you can edit the registry:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]

And set the value of ConsentPromptBehaviorAdmin to zero (0) and Reboot.

However, it also mentions that this doesn’t work, and the best found alternative is to use a 3rd party file browser (directory commander or something similar, or use RtvReco for Windows to automatically close it as soon as it appears.

rename_prompt

registry_window

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