MPG file opened in Microsoft Windows Media Player 12
MPEG-1 or MPEG-2 audio and video compression is integrated into MPG files. A huge number of audio and video players support one of the popular lossy video/audio formats, MPEG-1. To overcome the issues with MPEG-1, the MPEG-2 format was then developed. MPEG-1 has a two-channel audio compression system and can’t meet the higher resolution video requirements.
PS or MPEG-PS is a container format. The MPG files store streams in them. To deliver streams efficiently, the MPG format includes audio, video, and metadata that are interleaved together.
A lot of media players can open and play MPG files. For Windows, you have Windows Media Player and for macOS, you have QuickTime Player as a default. However, alternatives like VLC Media Player or Elmedia Player are much more popular than the native players.