I am running Windows 7, and I have a mapped network drive. Is there any way to examine a file on that drive and find out who was the last user who modified it? If so, how can I do this?
Sorry, only the modification date is logged by Windows 7.
You only can achieve this with logging, there are two options:
Keep using the network shares, set up Process Monitor to log the file events on the network share.
Go for a different protocol like a Filezilla Server, you could look backwards in the FTP logs.
Don't forget to read Randolph's Comment on your question, it allows you to get the name given the date.