The term indicates a standard video file format. If "Sexy Girl (1730).mp4" is a specific file you have encountered:
I cannot find any specific movie, documentary, or official media title named "." It is possible this is a misremembered title, a very obscure file name, or a reference to a specific digital asset. Sexy Girl (1730) mp4
: An experimental short film on IMDb that explores the relationship between sex and power for Black women. The term indicates a standard video file format
: A film starring Bel Powley that explores a young girl's self-image and sexual awakening in the 1970s. a very obscure file name
: If this is a stock footage clip (common in 1700s historical recreations or costume design), it may be from a library like Xara or another creative asset platform.