Okay, when I open that in Inkscape, I get a group of 64 objects. Ungrouping results in 64 paths. What we want is one composite path, with everything properly closed up. Usually I would export this to a .pdf, open that in Macromedia Freehand, delete the small slot indicator lines, select all, join, Modify | Alter Path | Correct Direction and be done (save for exporting back to a .pdf, opening that in Inkscape, and re-saving as an SVG).
- open the file in Inkscape
- zoom in one each corner and delete the extraneous slot indicator lines
- select all
- Path | Combine resulting in a path of 174 nodes
- try importing, and determine that the file doesn't import properly --- some lines are missing --- usually this is caused by duplicated / stacked geometry. Looking at the file we can see that some lines are darker than others --- select each of those and delete, revealing a duplicate underneath --- repeat until all such duplicates are identified and removed
- select all the small, already closed objects and move them to a separate layer on top for easier manipulation --- this is an awkward burlesque in Inkscape of selection and invoking the same menu command over, and over again --- not much better in Adobe Illustrator
- note that if you select all the objects which ought to make up the perimeter and do to Path | Combine, then fill the path, you will get an appearance which alludes to the incorrect import
Laboriously select each component, use the pen tool to connect it to the next, reverse path direction as needed, until finally one arrives at a shape which is a composite, closed path of 115 nodes.
quad.c2d (833.2 KB)