OmniPage User Dictionary
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What is a 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.