What I've done wrong?

I'm using MacOS X 10.9.5 Mavericks on my Mac Pro mid 2012.  I tried to rename a mpeg file and this resulted in a file "GZ with zipper. Someone would be kind enough to teach me on how to change this zip file in the original mpeg file.  See attached picture.

Returns the extension of the file to what it was originally.

(137584)

Tags: Mac OS & System Software

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