Non-wildcard find and replaces don't care about the variants of apostrophes but Wildcard searches do. A dumb quote is only one of the apostrophe types - we also have an opening smart quote, closing smart quote and an official apostrophe. See Replacing Some Smart Quotes (Microsoft Word) for more detail.

You will need to find out what particular apostrophe variant is in play here and enter that by holding the Alt key down and typing 0145 or 0146 or 0147 or 0148. You could cover all the bases by adding all of them.

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Andrew Lockton
Chrysalis Design, Melbourne Australia