.JTD File Extension

I am trying to read a .JTD file. I live and work in Japan and am able to read Japanese. However, I found some old work left by a Japanese friend which he had done using Ichitaro Word Processing file extension .JTD

Naturally I cannot open ANY of them or find out how I can even convert them to a PDF file. There are so many files and I need help.

Quite lost, to say the least. Could you tell me what I should do in order to open/convert or edit these .JTD files, please?

Hope you figured this out, but if you haven't, you should be able to open these files with OpenOffice.org.