hi..... im using excel 2003 and windows xp, running the following code im getting an error, which excel doesnt even open

Public Declare Function GetCommandLineA Lib "Kernel32" ()

Sub probe()
Dim s As String
s = String(255, " ")
s = GetCommandLineA
MsgBox s
End Sub

ive searched hard on the internet and apparently many people gets this error, but i cant find a solution anywhere
strange thing is that in word 2003 it works fine.....
someone with a good heart would help me ? ;D