This python module forwards calls to Windows binaries from WSL (Windows Subsystem for Linux) bash shells also converting any path style arguments starting with /mnt/ to their Windows equivalent. Without this conversion the Windows binaries will attempt to open Linux file paths and fail.
Invoking Sublime Text 3 from a WSL bash prompt:
$ wslexeshim.py "/mnt/c/Program Files/Sublime Text 3/subl.exe" -n -w /mnt/d/README.md