that's easy: because some people like it. now you know.
That's normal, the PATH you modify in your terminal in not used by Finder.
Take a look at this thread
In any case, you should rather go to the Run part of the Project panel, there you can add these variables for your project so you won't be interfering with others.
@theunsheydenrych I rebooted the Windows machine and it was fine again.
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