I need help big time!

[Mortar]

Well, earlier today I was happily using RPG Maker XP Postality Knights Edition ENHANCED, when I had to go to get something, I came back and when I opened my project it said 'Unexpected file format'. I really don't know what to do, someone help me please!

[Fortis]

Mhmk, well, you might have compiled your game, if you did that you can't edit it. Or, you might have renamed the project file, go into Tools -> Folder Options -> View And Untick 'show file exetensions for known file types' Then rename the project 'nameoffolder.rxproj'
Do not forget the .rxproj

[Mortar]

I've tried it, it doesn't work