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MOVEit Transfer uses the GNU Aspell program as a back-end for its spell-checking services for packages. This program uses a flexible dictionary mechanism to determine whether words are misspelled or not, and is easily expandable. As an example, MOVEit Transfer comes with two custom-made additional dictionary files, including a 60,000-term medical dictionary, which are configured to be used by the Aspell back-end by default.
To create custom dictionaries for use by Aspell, you create a text file that contains your word list, compile the text file into an Aspell dictionary file, and configure Aspell to use that dictionary file. See details, below.
Prerequisites: You must have access to the Aspell program and data files, which are stored in the Aspell subdirectory of your MOVEit Transfer non-web directory (by default, D:\MOVEitDMZ) on your server.
A custom dictionary starts with a text file containing a list of words. Each word should be on a separate line and the last line should be left blank. The wordlist file can be named anything and stored anywhere, however it is recommended you follow the examples included, which store the file as a .wordlist file in the bin subdirectory of the Aspell directory (e.g., D:\MOVEitDMZ\Aspell\bin\custom.wordlist). In the case of the examples, the wordlist files are called medical.wordlist and sni.wordlist.
Once you have a custom wordlist file, the next step is to create a compiled dictionary file based on that wordlist file. To manually compile a dictionary file from your wordlist file, open a command-prompt and CD to the bin subdirectory of the Aspell directory. Then, execute the following command:
aspell --lang=en create master en-custom.rws < custom.wordlist
...being sure to use the correct name of your wordlist file as the final argument. Again, the dictionary file created by this process can be called anything, but for ease of maintenance, it is recommended you use a format similar to the examples - this means starting the filename with the language of your dictionary (typically en for English), followed by a dash and the name of your wordlist file, and ending with the extension of .rws.
If you plan on periodically making changes to your custom dictionary, it would be best to create a batch file to run the above compilation command. See the build_en-medical.bat and build_en-sni.bat examples.
Aspell stores its dictionary files in the dict subdirectory of the Aspell directory. Copy your .rws dictionary file to that location.
To allow Aspell to use multiple dictionaries at once, it utilizes .multi files, which tell Aspell which dictionary files to use for which language. Each .multi file contains a list of commands, one on each line, which tell Aspell how to put together a complete list of words for spellchecking. The most used .multi files are the files en.multi and en_US.multi. Open these two files up in a text editor, and you will see that they are fairly similar (en.multi includes the en_GB-only.rws dictionary, which contains a British-English wordlist). You should also see commands to load the two included example dictionaries, en-medical.rws and en-sni.rws. To load your custom dictionary, add a similar add command with your dictionary file as the argument to both .multi files. Aspell should immediately begin using your custom dictionary when spell-checking input.