I don't know if it's still true for en_US help, but by the past, the
*files* contained links to the how-to and to the Calc functions.
By files, do you mean the in program help files?
should have more info about it, but maybe there is a need to check if
links are still pointing to the good page?
I found at least one bad link on the help wiki
Some wiki pages were under "How Tos" and others under "HowTo". I merged
everything under "HowTo", but this one links to a page under "How Tos", so
now it gets redirected.