When I took over Sigil, I updated the dictionaries to be the best ones from Apache/Open/Libre office I could find that had compatible licenses. The key is to look at the .aff file to make sure it has the most common prefixes and suffixes listed, and the make sure the .dic file actually uses those prefixes and suffixes, and is not just long list of words. A good dic, will show a list of root words with single char suffix and prefix flags attached to each root word entry. In this way a shorter list of root words and flags can represent a much much longer list of words than is possible without. It will load quicker and will do a better job. That is the whole purpose of using an affix approach.
So unpack that dictionary and head the .dic file and look for root words with flags (or post a snapshot here). If it doesn't use affix compression, it is generally not worth using.
KevinH
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