Here are the files. Without any annotation, they don't tell you much. If you could lay your hands on files 2749.nam, 2749.exp, 2750.nam, and 2750.exp, that would be helpful. Those are the files that include address names and rung comments.
It's no surprise that Automation Direct can't import Series Six files. While Logicmaster One and Logicmater Six shared a common look and feel and used the same conventions for filename extensions, the similarity ended there. While the Series One was made by Koyo and branded GE, the Series Six was made by GE.