Datei-Eigenschaften zeigen (Eigenschaften-Fenster)

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[StructLayout(LayoutKind.Sequential)]
public struct SHELLEXECUTEINFO
{
        public int cbSize;
        public uint fMask;
        public IntPtr hwnd;
        public String lpVerb;
        public String lpFile;
        public String lpParameters;
        public String lpDirectory;
        public int nShow;
        public int hInstApp;
        public int lpIDList;
        public String lpClass;
        public int hkeyClass;
        public uint dwHotKey;
        public int hIcon;
        public int hProcess;
}

....

private const int SW_SHOW = 5;
private const uint SEE_MASK_INVOKEIDLIST = 12;

[DllImport("shell32.dll")]
static extern bool ShellExecuteEx(ref SHELLEXECUTEINFO lpExecInfo);

public static void ShowProperties(string path)
{
            FileInfo fi = new FileInfo(path);

            SHELLEXECUTEINFO info = new SHELLEXECUTEINFO();
            info.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(info);
            info.lpVerb = "properties";
            info.lpFile = fi.Name;
            info.lpDirectory = fi.DirectoryName;
            info.nShow = SW_SHOW;
            info.fMask = SEE_MASK_INVOKEIDLIST;
            ShellExecuteEx(ref info);
}

// Beispielaufruf:

// die Eingenschaften des Verzeichnisses "c:\temp" anzeigen
ShowProperties(@"c:\temp");

// die Eingenschaften der Datei "c:\temp\test.bmp" anzeigen
ShowProperties(@"c:\temp\test.bmp");