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Larkspur
I'd created a restore point just before the installation, but after performing the Restore, 6.1 remained thoroughly screwed up.
https://developer.mozilla.org/en-US/docs/Mozilla/About_omni.ja_(formerly_omni.jar)
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Mozilla
Starting with Firefox 10 and Thunderbird 10, the file extension .ja is used because Windows System Restore does not back up files with the .jar extension, but it does back up .ja files. This change was needed to prevent Firefox from becoming corrupted.
Uh oh... that doesn't sound good
In the case of KM1.6, it does contain some native jar-files in the folder "chrome".
Perhaps it helps to copy them over manually again, extracted from a zipped KM1.6 download, but no idea.
But there are also a few rare extensions out there which come with a jar-file.
The question is also, would overwriting with km74 actually *delete* the old chrome folder?? Perhaps a setup-version?
And the next question: what if we use the popular old method of just unzipping a new KM into the old KM folder, and the new one is KM74?? Would it ignore the old chrome folder, since it's not used any more, or would it mess anything?