GetVersionInfo

FileVersionInfo.GetVersionInfo("D:/Notepad.exe").FileVersion act in different way when the file is Open or not.

If the file is Open the version returned is empty

Don't know if a bug of Sharpdevelop or .NET framework. In any case all other file properties are returned correctly (length, creation date, modification date, etc.).

In order to reproduce the issue, try this:

        voidButton2Click(object sender, EventArgs e)
        {
            string versionFile = FileVersionInfo.GetVersionInfo("D:/Notepad.exe").FileVersion;
            using (var fs1 = newBinaryReader (File.Open ("D:/Notepad.exe", FileMode.Open)))
            {            
                MessageBox.Show  ("Version:   " + versionFile);                      //      returns correct fileversion
                MessageBox.Show ("Version:    " + FileVersionInfo.GetVersionInfo("D:/Notepad.exe").FileVersion);  // returns null
            }

Pc Configuration:

Windows 7

SharpDevelop Version : 5.1.0.5216-0e58df71
.NET Version         : 4.6.01055