in fileSystems extension

this line of code

if (LogonUser(ssUsername, ssDomain, ssPassword, 9, 0, out phToken) != 0)

need to be 

if (LogonUser(ssUsername, ssDomain, ssPassword, 3, 0, out phToken) != 0)

as LogonUserA function take types of logon from 1 to 7 only 

and i think the best choice is LOGON32_LOGON_NETWORK = 3

so extension could access shared folders with username and password correctly

so i did that and works fine now