R – Windows API to make Windows Vista and 7 semi-transparent screenshots

Individual components of a filename (i.e. each subdirectory along the path, and the final filename) are limited to 255 characters, and the total path length is limited to approximately 32,000 characters.

However, on Windows, you can't exceed MAX_PATH value (259 characters for files, 248 for folders). See http://msdn.microsoft.com/en-us/library/aa365247.aspx for full details.

You have to P/Invoke from dwmapi.dll

http://www.danielmoth.com/Blog/2006/06/vista-glass-in-c_17.html

However, this is not officially supported by Winforms, and the general consensus seems to be that the best way to get glass in a .NET application is to use WPF instead.