Sounds like the extensions got stripped somewhere on it's way to you - even Excel itself wouldn't recognise them in those circumstances. (It is quite legitimate for a file to have no extension at all)
The problem is that if you de-install (or supersede) the default program for a file type, it doesn't automatically set itslf back to anything else. You can easily force it to, by right clicking a file, choosing Open With, then you choose the program from a list, and check the box to make this the default program. This will then become the default program for all files with that extension.
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Open Office and MS Excel 