after further testing it seems the path issue is not really related to drive C but rather to the last geany open dir.
in geany 1.31, with win10: - Geany File > Open: execute on .html mostly works, but fails in the root of the drive - if not on the same drive as last Open: always fails -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/geany/geany/issues/1018#issuecomment-338381117