Hey John, it sounds like the files you're trying to open were saved in a format that isn’t directly viewable — likely HTML or JavaScript-based files. When you see the Opera logo on them and get a message about needing a JavaScript program, it usually means the file is trying to run a script but isn’t meant to be opened directly like a normal document.
Instead of double-clicking those files, try right-clicking and opening them in Opera or another browser like Chrome. If the files still don’t display properly, it’s possible they’re not complete webpages but rather partial data or links that don’t work offline. Let me know how you saved them originally — that can help figure out what’s going wrong.
Regards