_m_smp4

: In certain database structures or content management systems, _m is used as a suffix for "metadata," suggesting the file contains the technical properties or thumbnails for a primary MP4 video.

Could you tell me or what software you were using when it appeared? This will help me give you a much more specific answer. _m_smp4

Based on common file naming patterns, here are the most likely explanations for what you are seeing: : In certain database structures or content management