Win7/64: Routing Drive Letter To A Folder?

I have a Windows 7 64-bit laptop at a day program. I successfully copied WinMount to its hard drive. Unfortunately, I couldn't do a total install, as I don't have the administrator password. However, I was able to open it from a batch file and decompress the contents of an archive file to a folder on the desktop. Now, I want to temporarily redirect a Windows drive letter to the folder. How do I do it?

 

subst - https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/subst

 

• Thank you.

 

Another related question: if I execute SUBST from a batch file under Win98, will it affect other running applications? I.e. will I be able to access the drives from other running applications?