From my experience assisting a college professor set up Greek languages for his research, the first question I ask is, which dialect of Greek? I set his up for 6 different alpabetical sets, used for different dialects and eras. Second, did the writer use a ISO format for the Greek layout? If it is proprietary, you will ned the same formatter/layout tools, if available. Alternately, it may be a Unicode document, in which case try converting the .doc to .rtf and open it in TextEdit (if you are using OS X), or BBEdit (one that supports Unicode).
That's all I can think of currently.
Good Luck!