"Open With..." won't stick

I'd like to let .m4v files open with QuickTime player by default (and not by iTunes, which then starts to load/copy them). It used to be easy. take one such file, hit Cmd-i, set "open with" to QuickTime Player and check the box that makes it stick for all files.
But, when I do this now, not even the selected file will change. What can I try to fix this?

You may have a corrupt LaunchServices database. To verify this, please enable guest logins and fast user switching in the Accounts preference pane, then log in as Guest (no password needed.) Create a file, for example in TextEdit, and save it to the Desktop. Change the filename extension to 'm4v', then try to change the default opener for that file. If it changes, log out and log back into your account. Run the following command in a shell:
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchSe rvices.framework/Versions/A/Support/lsregister -kill -r -domain user
Then log out and log back in. This will reset all file-application associations. You can now disable guest logins, if you wish.
If changing the default opener doesn't work in the guest account, then you have a system-wide problem and probably need to reinstall.

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