I am unable to compile resources on linux

[ArsenShnurkov]

https://gist.github.com/ArsenShnurkov/4a0a39826d779b726724

./src/DiagramEditor/Properties/Resources.resx
(resgen) "Tool exited with code: 1. Output: libpng error: invalid after png_start_read_image or png_read_update_info"

may be related:
https://bugzilla.novell.com/show_bug.cgi?id=580549
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=738501

The code
var b = new System.Drawing.Bitmap ("./src/DiagramEditor/Resources/enum_item.png");
gives an exception "InvalidArgument" on mono on Linux