It may be that, when you install the Word Viewer, it adds the newer file formats (e.g. docx) to the list, as one of the things that will happen with the Word Viewer installation is that the docx converter gets installed along with it. I could understand that messing with your Works save options, but changing the actual save format is a whole different issue and isn't one I'd have expected. That said, given that Works was discontinued over a decade ago, I'd be inclined to convert all the wps files to doc or docx, since Microsoft will eventually stop supplying the format converters - they've already done that with numerous other file format converters that were originally included with Word and, for some time after they stopped being included, were made available for download (now they've gone altogether).

As for the "when I open one of the .doc documents I have saved, all I get is gibberish", does that apply to all doc format files, or only this one? If the latter, that suggests the file got corrupted somehow.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]