Help me! Every file is Winrar! [Please]

Oh god, I don't know what I have done, everything is now a winrar file, If I try to open a file it says: ''The file is either in unknown format or damaged''. I can't even post a print because I can't open paint!

Thanks Mike, I managed to figure it out. I managed to open a browser and download a ''Default_EXE.reg'', and everything was back to normal. Thank you anyways.

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