command_with_path = shutil.which(self.command) breaks Windows command support

[Stefanhg]

Describe the bug
When executing terminal commands the command_with_path = shutil.which(self.command) breaks Windows support
To Reproduce

import shutil
shutil.which("cd")
shutil.which("help")

Expected behavior
cd command will return nothing because in Windows each command does not have a file attached to it.
help does have a executable and will return a path