Using NotePad ++ to Detect Text File Encoding
You can detect the encoding a text file in NotePad ++ by looking on the bottom right, as shown in the red box in the screen grab below.
The manual for Relativity Desktop Client, the software that Relativity uses to import and export meta and documents, states that, "Relativity does not support Unicode .opt files for image imports. When you have a Unicode .opt file, you must resave this file in ANSI/Western European encoding." So ANSI , the American National Standards Institute, ASCII encoding is referred to by KCura as Western European text. If you have an image load file in UTF-8 unicode or something else you need to convert it.