It looks like could refer to a few different things depending on where you saw that filename. To give you the "proper piece" (whether that's a description, a context, or a fix), I need to know which one you're looking for:
Could you clarify where you found this filename or what the video is supposed to show? This will help me give you a much more useful answer! PGD-795-MR.mp4
: In some research settings, these codes are used for anonymized medical recordings (like an ultrasound or MRI clip). It looks like could refer to a few