enGB and ruRU locales db2 from 6.2.3 not working for me. Problem with strings reading is that reading strings code always reading out 4 bytes as 0 value so it always references to string dictionary with key 0 and getting empty string. But strings located in dictionary with strings sizes offsets.
For the second: problem with not found key. It's happening in DB2File.cs, somewhere near line ~320.
And the last thing: maybe it's just my problem, but converting Item-sparse.db2 to csv giving me a lot of NaN values. And I guess it will fail on backward conversation from csv to db2 because of that.