public static extern int OpenThemeFile(string pszFilename, string pszColor, string pszSize, out IntPtr hThemeFile, int dwReserved);

Declare Function OpenThemeFile Lib "uxtheme.dll" (ByVal String pszFilename, ByVal String pszColor, ByVal String pszSize, ByRef IntPtr hThemeFile, ByVal Integer dwReserved) As Integer

Public Shared Function OpenThemeFile(pszFilename As String, pszColor As String, pszSize As String, ByRef hThemeFile As IntPtr, dwReserved As Integer) As Integer

Function OpenThemeFile(pszThemeFileName: LPCWSTR; pszColorName: LPCWSTR; pszSizeName: LPCWSTR; hThemeFile: Pointer; unknown: DWORD): HRESULT; StdCall; External 'uxtheme.dll' Index 2;