This worked on an N82.
You will need a file manager that allows you to view system directories and files.
NEW LIST INSTRUCTIONS
01. In Custom Dictionary go to Options > Export and save your word list to a directory on your phone;
02. Copy your exported word list from your phone to your computer;
03. Open the list on your computer;
04. Edit the list and save in the same format (XML) and with the same extension (.word_list);
05. Copy the new word list file back to the directory on your phone;
06. Move the file c:\predic\[YOUR FILE].dat on your phone to a backup directory;
07. Open Custom Dictionary, there should be an empty list;
08. Go to Options > Import list and select your new word list file from your phone directory;
09. The new word list should have been imported and you should be able it view it;
10. Close and reopen Custom Dictionary to check everything is hunky dory.
NOTE
- If you mess things up you can always go back and use the old .dat file in your backup directory.
- If you're happy and Custom Dictionary is running okay, you can delete the old .dat file later if you wish.
CUSTOM DICTIONARY FOR N82 (S60 3rd Edition, Feature Pack 1)
Download from: http://betalabs.nokia.com/apps
Select: "For all other S60 3rd Edition devices" > Download.
Nokia says Custom Dictionary it's not compatible with the N82. It does work but has limited functionality and editing words is a hit and miss affair. It won't save words that are less than three characters and it can only import lower-case a~z characters, and that's it, no special characters or numbers. Because of these problems you will need to import your own cleaned-up list eventually.