_fmz1bw4b9836.avi

: Some industrial catalogs use similar alphanumeric strings for hardware parts. For instance, there are transition pieces for air conditioner kits like the Duct Kit Transition Piece from Direct Supply.

: This format is common for older raw video files or CCTV exports. _fmz1bw4b9836.avi

To provide a more accurate "piece" of information, could you clarify if this is a part of a puzzle, a specific film clip, or a line of code? : Some industrial catalogs use similar alphanumeric strings

If you are looking for a "piece" related to this file, it may be: a specific film clip