A family of Microsoft relational database management systems designed for ease of use.
It does seem extremely unlikely that this will prove a permanent solution, but I guess moving the back end periodically could be viable for some sites where the Registry changes are not allowed. I wonder if simply changing the back end file name has the same effect (i.e. any change to the full (back end) database path).
This might partly explain the difficulty MS have in reproducing the issue; perhaps the (back end) database path needs to be in use for an extended period before the bug arises. (Also bearing in mind that various Windows Updates seem to have triggered it in many cases, and caching seems to be involved.)
Hopefully this will provide MS engineers with much needed clues. What do you think Shane?