There are a few dead-tree compendiums of file formats (for
example, the
Encyclopedia of graphics file formats), but it's still
typically a chore to track down the details of a particular
file format. (PDF? Ok, Adobe must have something on
their site about it: argh! searching for "pdf" brings up every
pdf file on the site! Word 6? Ick, I have to poke around
Microsoft's website? Blargh.)
Fortunately, an intrepid programmer by the name of Paul Oliver
has put together a fairly comprehensive online depository
(categorized, and with a search engine) of file format
information. It's quite facinating just to browse about. Not
only did I find file formats that I didn't know about,
I found ones I didn't want to know about them either!
And if you can't find it there, but do find it
elsewhere, take a moment to let him know so the next poor sod
who's trying to import all her Casio Calculator Files to Excel
can catch a break.