from Help document:
Firmware eBook Applications works with dictionaries in StarDict format.
You can download it here:
http://xdxf.revdanica.com/down
By default the firmware archive includes English-Russian dictionary.
In order to add a new dictionary you have to perform the following actions:
Download archive with your SratDict dictionary
The archive should contain 3 files:
dictionary_name.dict.dz
dictionary_name.idx
dictionary_name.ifo
Copy these 3 files into the new folder
Copy this new folder into “ebookapplications/dictionary” folder in the internal memory of the device