How to open .gzr files?

Hey guys so i was wondering if we can actually open " .gzr " files hope you can help me out ! :D

http://s3.postimg.org/80k38y1gz/hello.gif

Step 1: Open Gunz.
Step 2: Clock on replay in the corner.
Step 3: Select your desired replay.
Step 4: Press play.
Step 5: ?????
Step 6: Profit.

.Gzr files can only be opened within GunZ client.

You could record using a 3rd party software or the F10 recording option in game.