Parsing through data from an old mac text editor. (Recovering data from a Mac floppy.)
Best guess with no additional information would be that it is a ClarisWorks file.

LibreOffice should be able to open it - the translation is apparently not perfect, but might be good enough to work with.

Idea garnered from How to open your ClarisWorks files for a stroll down memory lane

There's also the possibility of extracting the files directly from the floppy to Windows using MacDrive or even MacDisk (though that looks pretty old) rather than trying to pick bits out of a WinImage file.