I have a custom material database but cant select any material?

I do this

Dim

Material As String

Material =

"St.37"

Part = swApp.ActiveDoc

boolstatus = Part.Extension.SelectByID2(

"Unknown", "BROWSERITEM", 0, 0, 0, False, 0, Nothing, 0)

boolstatus = Part.Extension.SelectByID2(

"Unknown", "BROWSERITEM", 0, 0, 0, False, 0, Nothing, 0)

Part.ClearSelection2(

True)

Part.SetMaterialPropertyName2(

"Default", "C:/Documents and Settings/Kim Almind Pedersen/Dokumenter/KAP/Kapdata/SolidWorks/materials.sldmat", Material)

and nothing is working

but if I replace

Part.SetMaterialPropertyName2("Default", "C:/Documents and Settings/Kim Almind Pedersen/Dokumenter/KAP/Kapdata/SolidWorks/materials.sldmat", Material)

Whit

Part.SetMaterialPropertyName2(

"Default", "C:/Programmer/SolidWorks Corp/SolidWorks/lang/english/sldmaterials/SolidWorks Materials.sldmat", Material)

it is working becourse it is the standard solidworks material database

wat do I do wrang?

SolidworksApi macros