I write about a specialist subject for my living and over the years I have built up a custom.dic of specialist terms that now totals almost 60,000 words (it also includes non-specialist words, of course). I was using Word 2003 until I recently upgraded my PC and, with it, I upgraded to Office 2010, thus I now use Word 2010. In Word 2003 I called this specialist dictionary custom2.dic and it seemed simple enough to place a copy into the correct directory, go to File, Options, Proofing and click on Custom Dictionaries to make custom2.dic my default. However, as soon as I use Spellcheck, this file is reduced from 1.08MB to 170KB, and the words reduced to just 9,000-odd. Any ideas why this happens and, more importantly, any suggestions, please, how I can retain all 60,000 words?