Hi,
I downloaded Code Writer from the Windows App Store, and it looks great to me!
May I suggest an improvement, if I happen to open the same file twice, such file appears twice in the top navigation bar. A nice feature would be to prevent this behavior, opening back the editor where the file was first opened.
Anyway, this is not a complaint, you're doing a really great job. I'm just not good at complimenting :D
Cheers,
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Crono Leonhart