It is 2018 and this error message is a mistake from 1974. This limitation, which is still found in the very latest Windows 10, dates back to BEFORE STAR WARS. This bug is as old as Watergate.pic.twitter.com/pPbkZiE57t
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"your filename must contain at least one uppercase and one lowercase character, one digit and one special character and be at least 16 characters long"