get returns the physical path and filename of any EXE or DLL running on a system in vb6

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i m using Below Code to get returns the physical path and filename of any EXE or DLL running on my windows xp system this code is working on win98 nt and 2000 but it is not working on windows xp.

Public Const TH32CS_SNAPPROCESS As Long = 2&
Public Const MAX_PATH As Integer = 260
Public Type PROCESSENTRY32
    dwSize As Long
    cntUsage As Long
    th32ProcessID As Long
    th32DefaultHeapID As Long
    th32ModuleID As Long
    cntThreads As Long
    th32ParentProcessID As Long
    pcPriClassBase As Long
    dwFlags As Long
    szExeFile As String * MAX_PATH
End Type
Public Declare Function CreateToolhelpSnapshot Lib "Kernel32" Alias _
"CreateToolhelp32Snapshot" (ByVal lFlags As Long, ByVal lProcessID As Long) As Long
Public Declare Function ProcessFirst Lib "Kernel32" Alias "Process32First" _
() '(ByVal hSnapShot As Long, uProcess As PROCESSENTRY32) As Long
Public Declare Function ProcessNext Lib "Kernel32" Alias "Process32Next" _
() '(ByVal hSnapShot As Long, uProcess As PROCESSENTRY32) As Long
Public Declare Sub CloseHandle Lib "Kernel32" (ByVal hPass As Long)

Private Sub Command1_Click()
Dim hSnapShot As Long
Dim uProcess As PROCESSENTRY32
Dim r As Long
hSnapShot = CreateToolhelpSnapshot(TH32CS_SNAPPROCESS, 0&)
If hSnapShot = 0 Then
    Exit Sub
End If
uProcess.dwSize = Len(uProcess)
r = ProcessFirst(hSnapShot, uProcess)
Do While r
    List1.AddItem uProcess.szExeFile
    r = ProcessNext(hSnapShot, uProcess)
Loop
Call CloseHandle(hSnapShot)
End Sub

[edit]Code block added - OriginalGriff[/edit]