Can't open ANY of my custom maps to edit

[fickledorf]

I accidently clicked 'open with...' for my custom map and I clicked a random file... Now, I can't open my custom map or any other custom map, so I can't edit any of them. What file should I open my custom map with?

I have a Windows 7
If there is any other info you need please do not hesitate to ask.

Thanks a lot!

Fickledorf

P.S. Sorry, I'm not too good with computers

[Traggey]

If you simply launch the level editor and open the map files from there it's not a problem.

[fickledorf]

Oh, thank you very much!