The Windows OS is not case-sensitive, whereas Linux & Mac are. In Linux & Mac, it is perfectly valid to have two folders with the same names but different capitalization, like so:

[user@host models]$ ls -al
total 16
drwxr-xr-x 4 user simpack 4096 Aug 27 11:03 .
drwxr-xr-x 8 user simpack 4096 Aug 27 11:03 ..
drwxr-xr-x 2 user simpack 4096 Aug 27 11:03 subsystem
drwxr-xr-x 2 user simpack 4096 Aug 27 11:03 SUBSYSTEM

DO NOT DO THIS. If you try to work with GunnShow drawings in these folders, your Windows OS (or virtual machine, remote desktop server, etc.) can’t distinguish between these two folders and you may not be able to open the drawings in Visio.