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There isn't any way to get the greek from this document other than by viewing it as PDF or one of the other formats that is image-based.
The book was originally scanned to PDF as images, then processed by OCR. Each page in the PDF is an image, backed with hidden OCRed text. When you look at the PDF, you are seeing the image. Seeing the margin notes and annotations is further evidence that the image is being shown. When you select text, you are selecting the hidden text behind the image.
When Microsoft scanned it for the library, they made no attempt to switch fonts to greek, or even to recognize it. Instead, they let the OCR system find whatever characters it wanted to. This is a very reasonable approach, given that when looking at the PDF, one sees the image, not the scanned text, and given that attempting to render the greek would be extremely labor-intensive. However, it does mean that other formats that don't have the two-layer image/text structure will show near-match characters instead of Greek.
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