After a bit of digging it would appear that the WPF built in spell checker only supports English, Spanish, French, and German – which beggars belief somewhat. I can understand they can’t really ship comprehensive spell checkers for every language with WPF, but I’d at least expect it to be able to use the Office ones if they are installed.
Rant aside, has anyone had any success in replacing the current dictionary with one with wider language support, either by rolling your own or using a 3rd party component? A quick search throws up a few possibilities, but I’d appreciate any advice from anyone with first hand experience. This particular product has an international audience, so language support needs to be pretty comprehensive.
For those that care we ended up “rolling our own” using NHunspell. We lose the red squiggleys, which is a shame, but the F7 Word style spellcheck dialog does the job.