How to get rid of filename.ext.gz?

Hi,
Recently I had someone attempt to move one of my web sites. The transfer was not a successful. However, all of the files were turned into converted into .gz files. Example:

index.php -> index.php.gz

He says he used gzip and gunzip did not work.

How do I convert this back/fix this?

Thanks,
Teknet

 

 

 

 

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