put it in a rar, then password that. Or make it an sfx archive and use that as an exe instead, using Winrar.
MS Word 2003 implements an RTF version that supports passwords, so it's possible. (The old trick of saving a Word doc as RTF to bypass protection no longer works.) But even their 1.8 RTF spec (http://www.microsoft.com/downloads/details.aspx?familyid=ac57de32-17f0-4b46-9e4e-467ef9bc5540&displaylang=en) still says "Also, there is currently no method for storing passwords in RTF, so...".
rtf file is used over a doc file when the receiver does not have the same version of software as yours. If the receiver has the same version of software as yours then doc file is ok to send as the receiver will be able to open it. If you do not know what version the receiver has then send rtf file as any one either having a old or new version will be able to open an rtf file
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