How could I determine which SMB client/session has a specific file open on a Server 2008R2 Windows file server?

What I need is a way to associate a client name or IP address with an open file, so that I can cleanly close the file for maintenance. NET SESSION doesn't show the names of open files and NET FILE doesn't show the client which has the file open. I had hoped that I could cross-reference the data from these two commands, but that doesn't seem possible. Everything else I've see provides the same data as these commands, with no apparent way to determine which client machine has the file open.

Clarification: I do not want to force the files closed on the server, risking file corruption and causing the client program to crash.

Solution 1:

You can usually get a pretty good idea of this just by opening "Share and Storage Management" on your 2008R2 server, and over in the right pane you'll see "Manage Sessions" and "Manage Open Files". You might try that first.

If that fails, you might try Process Explorer from Sysinternals. Do a handle search for the file name. The process that has an open handle to that file should be found. To what user account does that process belong?

EDIT: Sorry OP, I took you on a detour because I didn't fully understand your question.