Character codes do not always map directly to a standard symbol set and so plain text extracted from a document may not match the characters in the original document.
Sometimes this is because the font has been downloaded by the type of printer driver that generates arbitrary character codes. In this case, use the RedTitan EEfonts iconEEfonts program to set up a character recognition database so that EscapeE 'eE' iconEscapeE can do the text conversion.

Select Set up database for character recognition from the EscapeE 'Fonts' menu.

See also Code tables.
If there are just a few errant characters extracted from a document, it may be because the original document used some non-standard character codes that EscapeE has not recognized. In this situation you can assign appropriate character codes directly: see Assigning character codes.