OPC extension of a part name: the substring after the last dot of the final segment, ASCII-lowercased — _rels/.rels has extension "rels" (unlike POSIX path.extname, which returns "" for dotfiles). Returns "" when the final segment has no dot.
_rels/.rels
path.extname
OPC extension of a part name: the substring after the last dot of the final segment, ASCII-lowercased —
_rels/.relshas extension "rels" (unlike POSIXpath.extname, which returns "" for dotfiles). Returns "" when the final segment has no dot.