What engines search "dot" criteria?

I want to search for Adobe Illustrator art files. These have ".ai" suffix.

For example, searching for a file "cable.ai", the search engines I tried 
won't preserve the dot; they return results where "cable" and "ai" are 
separate. 

Are there search engines that will treat the dot as part of the search 
criteria?

Thanks,
-- 
Please, no "Go Google this" replies. I wouldn't 
ask a question here if I hadn't done that already. 

DaveC
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