Shell Statement for URLs crashes with NT & 2000 ??!?

[Reddawn]

I execute the following code from W98 ;

code:

Private Sub Picture1_DblClick()
Dim Keyword As Variant
Keyword = "start.exe " & AnaSayfa
Keyword = Shell(Keyword, vbHide)
End Sub

'Where Public AnaSayfa is as string and is ;= "http://www.blablasite.com/default.asp?"

This code executes with no problems on Win98 however on NT4.0 and 2000 it crashes..

WHY?