public static void OpenFolderAndSelectFiles(string folder, params string[] filesToSelect)
{
IntPtr dir = ILCreateFromPath(folder);
var filesToSelectIntPtrs = new IntPtr[filesToSelect.Length];
for (int i = 0; i < filesToSelect.Length; i++)
{
filesToSelectIntPtrs[i] = ILCreateFromPath(filesToSelect[i]);
}
SHOpenFolderAndSelectItems(dir, (uint)filesToSelect.Length, filesToSelectIntPtrs, 0);
ReleaseComObject(dir);
ReleaseComObject(filesToSelectIntPtrs);
}