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Which would be better when a both functions exist for the same command? Question comes from the fact that I'm recovering old-but-useful routines written for AutoCAD R14, and I would like to reduce the translation at minimum, if it don't becomes a painfully lost of efficiency...

Once upon a time, in 2005, a basic map of our local communitty college was created as an AutoCAD drawing. The map included buildings, sidewalks and parking areas. As a student in 2010 I made copies of this map, did some surveying of planting beds and added the results to the 2005 on 2010 CAD. I have my 2010 drawings on an older computer. I was not able to view the drawings because 2010 expired. Rather than renew the older version I bought a new computer and acquired AutoCAD 2015. Then copy/paste the folders contents to new computer where I could finally open them and view them........ ........but I cannot print them. Is it because the original map is too old? I get Proxy information which says.....contains custom object created by unavailable Object ARX application. Missing Application : Aec Civil Cogo. Should I be more specific with my copy request when transfering files from old to new computer? Or could it please be something simple like.....unlock something so you can print. I have a fun project ahead of me but before I can start I need to know if I have to start from the beginning of time....or can I add more detail to an existing project. My immediate goal is to reclaim the 2015 map to print and add more details to it.

I just want to know how will I open a drawing file if its saved on an older version and I am using a latest version of autocad. thanks.