Hello Neeba,

It happens because on Win2k u are using IIS6, which blocks calls to filesystem
by default - NETWORK SERVICE account restriction
when u run this app under WinXP u are running in IIS5, which allows calls
to filesystem

Solution:
1) grad permition to access filesystem for NETWORK SERVICE, or create special
use (recomended)
2) use IIS5 isolation mode settings in IIS6

---
WBR,
Michael  Nemtsev [.NET/C# MVP] :: blog: http://spaces.live.com/laflour 

"The greatest danger for most of us is not that our aim is too high and we
miss it, but that it is too low and we reach it" (c) Michelangelo

N> Scenario :
N>
N> 1.    The Department files to be accessed are present in the File
N> server.
N> 2.    The Code is present in a different server with OS being Windows
N> Server
N> 2003.
N> 3.    Access to File server happens using ADS Authentication.
N> 4.    Code is developed in ASP.NET using VB.NET. (Web.Config file
N> settings are
N> based on ADS Login; Authentication=Windows ; )
N> 5.    Requirement is to display folders and files in a  treeview
N> structure.
N> [Built in functions like GetDirectories and GetFiles  returns nothing
N> and
N> functions related to Kernel Programming like (Private Declare
N> Function
N> FindFirstFile Lib "kernel32" Alias "FindFirstFileA" (ByVal lpFileName
N> As
N> String, ByRef lpFindFileData As WIN32_FIND_DATA) As Integer—
N> Returns -1 )]
N> when executed from Windows Server 2003.
N> 6.    The same code works fine without any issues when run locally from
N> an XP
N> machine.