Yes it is a very useful site, more to check out unknown executable files for malicious intent. Unfortunately there isn't anything concrete, e.g. reference to any specific program.
If the Files properties give a creation date that is correspondingly old then I would say it is a safe bet to delete, however it would be safer to rename the file to say uninstOLD.exe. That way if something tries to use it (uninst.exe) then windows would report a missing file.
You could also do a registry search for the file name and see if that brings up anything.