A DLL file contains some images inside PNG resource type.
I can view the PNG images in softwares like Resource Hacker, Anolis Resourcer & Resource Tuner. Check this screenshot of Anolis Resourcer for more details:
Can someone tell me how do I get the PNG image no. 5220 from the DLL file and put it inside a PictureBox? I don’t think APIs like LoadImage or LoadBitmap will work.

where
AssemblyName.test.pngis the fully qualified name of the embedded resource inside the assembly.UPDATE:
It seems that you are trying to extract resources from a native assembly. You may take a look at the following article which illustrates how this could be done using P/Invoke.