You can use the SUBST command to map a pseudo drive letter to drive/directory
subst r: d:winntsystem32
would map the letter r to the directory winntsystem32 on the d: drive.
You can use the SUBST command to map a pseudo drive letter to drive/directory
subst r: d:winntsystem32
would map the letter r to the directory winntsystem32 on the d: drive.