Upon quick troubleshooting of #702 on appveyor, it seems that their (succesfull) execution was never tested on windows (last succesful appeveyor run is https://ci.appveyor.com/project/Byron/gitpython/build/1.0.161 if I got it right).
I could not figure out a legit way to make hooks runnable without us parsing the shebang etc.
Use bash to open extensionless hooks on windows
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Use bash to open extensionless hooks on windows
Use bash to open extensionless hooks on windows