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An maybe easyer version:

When u save the game - the file name is xxxxxxxx.zip or just xxxxxxxx.

If its xxxxxxx.zip delete zip and replace with jar. Then the game is named xxxxxxx.jar instead and now u can hit save. 

if its xxxxxxxxxx u have to write .jar after the filename. so the game is named xxxxxxxxx.jar and then hit save.

Hope u understand if not - use the very good guide Dismay have made