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It isn't something I have used but a quick check on my AutoCAD 2021 and it works OK, so like Mhupp says, will need a bit more info about why it isn't working. Is it the whole thing not working or just 1 part, is there an error message and what does it say, where does it stop working.... but "this is broken" doesn't really help a lot

... and a short animation:

If you want to go the DXF route, then first of all make the DXF file. Open it in a text file and look for the word ENTITIES, then all the drawing lines are listed after that in the following format (red text are my comments):-

Getting all start end of lines is easy using lisp, there are two simple methods available, 1st is as you suggest use (entget then (assoc 10 is start (assoc 11 is end pt, the 2nd is using VL (vlax-get Obj 'StartPoint) (vlax-get Obj 'EndPoint) If you have a pline again a couple of methods, use co-ordinates or (vlax-curve-getendpoint obj) there is other ways get vertex. Do you know how to process a selection set created using (ssget and then get start/end as provided. If not just google "get start end points lisp autocad" heaps of examples.

Hi, Instead of multiplying links to another web site, I post here my Edit_bloc routine. This function (command name: Edit_bloc) allows some changes on blocks definitions in the current drawing (the complete collection, all inserted, or a selection). All componants of the block are edited, even nested blocks and attributes. A dialog box allows to choose which properties shall be edited : global scale, units (only available on R2006 & R2007), componants on layer "0", color, line type, line width and plot style of componants to ByBlock. With another function (Edit_bloc_rep) it's possible to edit all the dwg files (wblock) of a repertory. This one must be launched from a virgin drawing and runed with "All collection" option. Edit_Bloc_3.5.zip