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Prproj files are now zipped XML to reduce size.
To expand on Steve's answer, the format uses gzip compression. If you unzip them and use plain XML then Premiere CC will read it but rezip it when it's resaved in the program.
How do I open it again on Premiere?
I can't open my project anymore, if you could let me know how, I'd appreciate it.
Why can't you? What exactly happens when you try?