Hi Burhan,
From within Word, try Insert → Object → PTC Drawing Document then find & select the .drw file and it should insert it into the drawing. I've not used this very much, so I don't know how well it works, but I often do a similar thing with AutoCAD drawings and it works quite well.
I'm not sure if this is OOTB functionality or if it needs to be set up manually before it can be used, but give it a try anyway.
David