Closing an open profile in AutoCAD

This is probably AutoCAD 101 stuff, but I am not trained in this application and I need a quick solution to what is probably an easy
issue.
I am opening AutoCAD 2007 .dwg and .dxf files in a third party application for nesting pieces of steel so as they can be cut on a plasma table. I have had the .dxf and .dwg files emailed to me from the contract drafter who is on the job for us and most of them are OK.
Buuuuuut, of course I have a few that are giving me the error message "Warning:two open profiles detected". I have contacted the software supplier for the burning software and they told me that the AutoCAD file was sent to me with profiles still open.
Now, rather than email the drafter every single time I get this message, is there an easy way to open the file in AutoCAD and simply close the profiles?
We have AutoCAD for viewing and printing these files, but nobody here can actually use it. I have tried checking the web, but my search criteria must be too vague to produce a useful, step by step answer.
Help...please.
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In article
snipped-for-privacy@gmail.com () wrote:

There is no 'of course' about it. Get the man to do it correctly.
Your main problem will be to locate (in AutoCAD) where the gaps are. Even the smallest, minutest, gap will be detected and will need correcting. Can you afford the time needed to look at every change in direction of the profile (assuming the gap is at a point of direction change - it might not be!)?
On top of that, it might not be a gap between two ends, but an overlap of the ends.
Go back to the source and threaten him with a baseball bat!
Brian.
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On May 9, 6:36 am, snipped-for-privacy@gmail.com wrote:

If the profile is made up of lines, you can close it with the fillet command with the FILLETRAD system variable set to 0. If the profile is made up of one polyline or lwpolyline, you can close it with the PEDIT command. if the profile has more than one gap, it would be best to use the EXPLODE command, then FILLET the lines together, and then use the PEDIT command to convert the lines back to one single LWPOLYLINE (also called a "polyline" by the command itself!). If it is still open, PEDIT will present a "CLOSE" option. If it is closed, PEDIT will present an "OPEN" option.
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