How to get directory of current file.

I am using gVim on Windows. I open a file in C:\tmp called file1.cpp. After looking around in file1.cpp I now want to open file2.cpp which is also in C:\tmp. So I run the command

:e .\file2.cpp

But this doesn't work because the "." is C:\Windows\system32. Is there a different character or function or variable I can use in command mode to designate "the directory that the current file is in"?

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