Basic questions about network shares

["Ciprian Slobodnic" <slobodnic () hotmail com>]

Is there any difference between a mapped network drive and an unmapped one
from a security standpoint? 
For instance, if I map \\server\share to Y: and I access the file
Y:\executable.exe is it more secure compared with
\\server\share\executable.exe?
If no, then why Microsoft on XP and Win2k3 they decided to give you a
warning "Some files can harm your computer ." when you try to execute the
file in the second way?
Will an anti-virus program be able to scan the executable the same in both
cases?


Thanks.

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