I don't think so because DWF (Drawing Web Format) was specifically created to be a read-only non-editable format for putting drawings on the web. The inability to edit these drawings are intentional for two reasons; copyright and liability. In both cases, if you need to edit the drawing, go back to the creator/owner of copyright and ask them for the original dwg. If this is an equipment supplier, I've had no trouble getting dwg's from them. (They DO want to encourage you to use THEIR product.)
[sig]<p> Imagineer<br><a href=mailto: > </a><br><a href= > </a><br> [/sig]