Thank you for your quick response Ray, but I've already tried using the DMXZone extension manager shortly after posting this in the fourms.
When I open Dreamweaver after DMXZone installs the extension, the program gets stuck trying to open the eCart tab and an error message pops up which reads:
The following JavaScript error(s) occured:
Unable to open script file "C:\Program Files\Adobe\Adobe
Dreamweaver CC
2015\Configuration\Shared\WebAssist\eCart\WA_RunCommand.js"
(error 3).
Any ideas on how to troubleshoot a JavaScript error specifically related to eCart?
Thanks