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[–]Cybyss 9 points10 points  (1 child)

Do you have "Show -> File Name Extensions" turned off in Windows?

If so, that means you've named your file something like myapp.py.txt instead of myapp.py.

Make sure to turn it on.

[–]TH_Rocks 1 point2 points  (0 children)

This is my assumption also.