public extern static Int32 GetThemeFilename(IntPtr hTheme, int iPartId, int iStateId, int iPropId, StringBuilder themeFileName, int themeFileNameLength);

Declare Auto Function GetThemeFilename Lib "uxtheme.dll" (hTheme as IntPtr, iPartId as Integer, iStateId as Integer, themeFileName as Integer, themeFileNameLength as Integer) As Integer