i'm afraid your files have become corrupted. at any rate, you saved them as .abw, which is abiword native format. i dont know any other program that handles that format
you could try to open the file in Gedit or similar simple text editor to see if you can copy the text out of it, in case you wrote a lot that needs to be saved.
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if you look in Software Center, and search for "word processor" you get a list of programs. some are extremely lightweight, like Focuswriter, and only meant for producing raw text with as little distraction as possible.
others like Calligra Words and Libreffice Writer (which you can install without the rest of libreoffice programs like impress or draw, to save space) are used for more graphic work.
i have no experience with Calligra, but Libreoffice Writer has a wide support of different formats. -just no .abw, sadly
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