It is unclear to me, when you say "lost" whether you mean you do not know where it has been saved, or that it has been deleted.
And when you say none worked, what didn't work ? Do you mean it didn't find the file, or that it found the file but the computer 'thinks' it is a Front Page document ?
Apologies but questions at this site seem to be getting less clear by the day, or maybe it's me getting old & senile.
Unfortunately if a file is deleted then the last thing you need to do is install further things over the top. It can overwrite the "deleted" data. Unfortunately a bit late for that now. Sorry to hear about 4 years work lost, but I guess it underlines the need to back up anything valuable from time to time.