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Craig, first of all please move this thread of general section (use move discussion option on right) as this post doesn't belong to SWUGN.
To answer your question, you can use free edrawings viewer to open/view/rotate/print the files. Free eDrawings Viewer for SolidWorks, DWG, and DXF Files
If you need to change them then yourself then you definitely need to the software else you can outsource them to someone else.
Thanks Deepak. I will try the eDrawings viewer. If I need more functionality I will look into that at that time.