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.

 

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.