Parameters have the same meaning as for SetSystemVisualStyle, except the new hThemeFile one which is the result of the function.

public static extern int SetSystemVisualStyle(string pszFilename, string pszColor, string pszSize, int dwReserved);

Shared Function SetSystemVisualStyle(ByVal pszFilename As String, ByVal pszColor As String, ByVal pszSize As String, ByVal dwReserved As Integer) As Integer

SetSystemVisualStyle(@"C:\WINDOWS\resources\Themes\Luna\Luna.msstyles", "Metallic", "NormalSize", 0);

SetSystemVisualStyle("C:\WINDOWS\resources\Themes\Luna\Luna.msstyles", "Metallic", "NormalSize", 0)