Canon StarWriter 70 files

Do you mean the driver files for a Canon StarWriter 70 printer?

Those file should already be in a DOS or Windows Format.

If you need a DOS or Windows driver, you can download them here:

http://consumer.usa.canon.com/ir/controller?act=DownloadIndexAct

Good Question:
My neighbor typed his entire poetry collection on his Canon StarWriter. Some of these Word Processors have an MS DOS export utility, some do not.
If there is no way to convert these files with a software based program (haven't seen one yet), then you may need to purchase a newer model Canon word-processor that is capable of the task.($40-$60, used) Make sure you read the manual first(If available).
Canon does not support any of their word processors, so you cannot download a users manual.
The other option is to use an OCR program like Text Bridge Pro, or Omni Page-Pro, and feed the hard-copies into a scanner for image-to-text conversion.
Otherwise, "Happy (Re)Typing !"