Slidee, a new search engine for Powerpoint presentations. Very underpopulated at present, but it may improve. It’s better than Google in one respect: Google Search currently refuses to show any results when using a doubled-up filetype search, so as to cover both types of Microsoft Office file, such as this one…

metadata “open access” filetype:pptx filetype:ppt

Bing doesn’t balk at double filetype: modifiers, but then it just seems to discard/ignore any .pptx results (Google sees 10 million of those). Odd, considering Bing is from Microsoft.