put command doesn't parse absolute path correctly under W10

[NoPinky]

when mpfshell is connected to the ESP8266 via serial under W10, I attemted to execute:
mpfs[/]put c:\scripts\awesomescript.py
and get the error message:
Invalid file name given: :scripts\awesomescript.py (notice the missing drive letter c)

If I put the script I want to upload in the same directory as mpfshell.py, it works fine. Maybe it is connected to issue #28