This matches `cmd.exe` behavior. For example, if there is only a file named `mycommand` in the cwd but it is a Linux executable, then running the command `mycommand` will result in:

'mycommand' is not recognized as an internal or external command, operable program or batch file.

However, if there is *both* a `mycommand` (that is a Linux executable) and a `mycommand.exe` that is a valid Windows exe, then running the command `mycommand` will successfully run `mycommand.exe`.