FileSystemWatcher doens't see any other drive than C

FileSystemWatcher doens't see any other drive than C

I have an app using FileSystemWatcher that works fine for C drive, it
fires events for each file is open, create... but when I change the path
for another drive, local or shared folder in the network, it doesn't do
anything, nether sent an error. Also, I found the path to be entered for
shared folder like this //servername/c$/
Does it need some setting else to support other drives? Please, any help..