11.2.8 Filename Manipulation

absolute_file_name(+R,-A)   hookable
absolute_file_name(+R,-A,+O)   hookable
expand relative filename R to absolute file name A using options specified in O
user:file_search_path(+F,-D)   hook
directory D is included in file search path F
user:library_directory(-D)   hook
D is a library directory that will be searched

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