Quote:
Originally Posted by ted13b
...Is this caused by an improper file conversion?..
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Possibly, they could be characters that the reader can't display and the reader is substituting a "?" to indicate the unknown character. This happens when font encoding it not properly handled during conversion or when things like Word's soft hyphens are embedded in the text. If so, there may be ways of "repairing" the file. Other posts have made reasonable suggestions to try.
They could also be real question marks, or all identical undisplayable characters, placed in the text by the OCR software that was used to convert scanned pages into actual text. If this is the case there is no way to fix the file by reprocessing it. You would have to manually edit the text and insert the correct characters.