PNG, or Portable Network Graphics, is an image format often used in video games.
Its DBPF 1.0/1.1 Type ID is 856DDBAC.
Its DBPF 2.0/3.0 Type ID is 2F7D0004.
SimCity 4 uses it for a variety of purposes. It is used for screenshots taken in-game, but it is also the format used for user interface elements in DBPF files.
SimCity (2013) uses it to store user interface elements in DBPF files.