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Not sure what to say. Changing back to a .txt shouldn't be an issue at all. The two formats are actually exactly the same structurally. It shouldn't take out the comma's. I do this regularly and haven't had an issue.
One thing that occurs to me, not sure what you mean by convert. All you need to do is simply to change the extension of the physical file, not to do a save as in your spreadsheet.
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