RunWithBash (Windows)

@echo off
cd %~d1%~p1
set File=%1
set File=%File:\=/%
set Letter=%File:~1,1%
set Letter=%Letter:A=a%
set Letter=%Letter:B=b%
set Letter=%Letter:C=c%
set Letter=%Letter:D=d%
set Letter=%Letter:E=e%
set Letter=%Letter:F=f%
set Letter=%Letter:G=g%
set Letter=%Letter:H=h%
set Letter=%Letter:I=i%
set Letter=%Letter:J=j%
set Letter=%Letter:K=k%
set Letter=%Letter:L=l%
set Letter=%Letter:M=m%
set Letter=%Letter:N=n%
set Letter=%Letter:O=o%
set Letter=%Letter:P=p%
set Letter=%Letter:Q=q%
set Letter=%Letter:R=r%
set Letter=%Letter:S=s%
set Letter=%Letter:T=t%
set Letter=%Letter:U=u%
set Letter=%Letter:V=v%
set Letter=%Letter:W=w%
set Letter=%Letter:X=x%
set Letter=%Letter:Y=y%
set Letter=%Letter:Z=z%
bash "/mnt/%Letter%/%File:~4%
exit /B