Greek Fonts Dont work in Office but work in Windows

I have a problem for a long time now and I would be grateful if someone knows
any solution.
I have installed the Greek fonts in Windows XP and I can see for example
filenames & directories in Greek, write documents in Greek etc.
But sometimes some programs do not display letters in Greek but in funny
characters.
One of them was winzip which could not keep the original Greek filenames &
directories.

More importantly Outlook has quite often the same problem. When I try to
create a new contact for example, I cut and paste Greek names into the
contact name & address field. The pasted text is not the original but again
funny characters. I have found that if I paste the copied greek text in the
notes field of the contact area (big empty box where one could write
comments) then the greek text is pasted fine. If I then copy that pasted text
from the notes field into the name field of the contact it is pasted OK with
out funny characters.

What is the problem?