re-ignoring a force added file

Dear Git Mailing List,

I have force added a file we usually like to ignore (but keep in the repository). That was a change a while ago, and cannot be undone without serious pain. I would like to re-ignore the file though, as we dont want to track changes to it. Some of the options I came across are not useful for me. For example

git rm --cached FILE // removes the file from the remote repository if I push, not desirable git update-index --assume-unchanged //Will ignore changes to the file locally, but someone else clones and the file is tracked for them.

What we would like is to go back to the old state of affairs: the file was in the working directory when someone cloned from the remote repository, but changes to the file werent tracked or committed.

Any help would be appreciated.

regards

Raza