Dict files can be merged with other Dict files or with simple text files. To merge a text file or Dict file, drag it on to the main text field, this will take all words from the file dropped and add them to the open Dict file. "Tools->Add Words From File" opens a file dialog, and has the same effect as dragging and dropping.
Simple text files can be of Plain Text, UTF-8 or Unicode encoding and must contain one word per line, eg;
word1 word2 ....
Any duplication of words occuring from merging will be removed when the Dict is saved.