What is .UD file?
User dictionary created for OmniPage, an optical character recognition (OCR) program; contains custom words, such as proper nouns, technical terms, and abbreviations that have been added by the user; supplements the program's built-in dictionary, which assists in the text recognition process.
NOTE: OmniPage includes multiple dictionaries for different languages. Each of these dictionaries may have its own user dictionary. Therefore, several user dictionaries may exist at one time.
Recommended Software Programs to open .UD file