...If the file is of a format that will open in it, "Photos" built in in Win10 allows you to capture individual frames as photos.
Simply stop the "movie" at the desired point, click on the three dots on the progress bar, and save the frame (to your desired location).
As to any other editing, it would depend on what you wish to achieve.
(Videos are often rather too large to add as email attachments, but it is possible to upload to a number of "staging" points, and pass a link allowing the recipient to download.
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