Uniqueness approach may differ both on the case sensitivity and on the Unicode normalization form such as NFC, NFD.
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type (format or extension) – indicates the content type of the file (e.g., .txt, .exe, .COM, etc.)
3GPP2 file format was designed for CDMA-based Phones and may have the filename extension .3g2
.m2ts, a filename extension used for the BDAV MPEG-2 Transport Stream, defined by Blu-ray Disc Association
Norton Commander (commonly shortened to "NC" by DOS users, due to its filename NC.exe) was a prototypical orthodox file manager (OFM), written by John Socha and released by Peter Norton Computing (later acquired in 1990 by the Symantec corporation).
The Bourne shell, sh, was written by Stephen Bourne at AT&T as the original Unix command line interpreter; it introduced the basic features common to all the Unix shells, including piping, here documents, command substitution, variables, control structures for condition-testing and looping and filename wildcarding.