Converting .spl spell files

Question

VIM spell files seem to be in some binary format. Is it possible (and easy) to convert one back to a plain text word list?

Answer 1

Yes, you can use :spelldump.

:spelld[ump]            Open a new window and fill it with all currently valid
                        words.  Compound words are not included.
                        Note: For some languages the result may be enormous,
                        causing Vim to run out of memory.

Vim will use the language file that you set with the 'spelllang' option.