Not working error : (
 

Unknown Error: mscorlib
at System.IO.__Error.WinIOError(Int32 errorCode, String str)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean useAsync, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode)
at WindowsApplication7.Form1.GetFileMD5(String FilePath)
at WindowsApplication7.Form1.DownloadExtras()
at WindowsApplication7.Form1.DoUpdates()
at WindowsApplication7.Form1.Timer3_Tick(Object sender, EventArgs e)
at System.Windows.Forms.Timer.OnTick(EventArgs e)
at System.Windows.Forms.Timer.Callback(IntPtr hWnd, Int32 msg, IntPtr idEvent, IntPtr dwTime)The process cannot access the file "C:\Program Files\Sony\EverQuest II\UI\EQ2MAP\images\maps\map_blank.dds" because it is being used by another process.

Did you run the updater while EQ2 was running?
Well try to reboot the computer and run it again.
If that does not help, try to delete:
"C:\Program Files\Sony\EverQuest II\UI\EQ2MAP\images\maps\map_blank.dds"
and run the Updater again.
Some how the access to this file was blocked.

Hope that helps out.

Vendolis