"Free hosting accounts are limited to the following file types:
.htm, .html, .gif, .jpg, .png, .txt, .swf, .mid, .rmi, .au, .wav, .js, .css, .ico, .bmp, .class, .dcr"

So it looks like as someone suggested, your best bet is to change the .doc to a .htm or .html and upload that. But the appearance may suffer.