I tried downloading some maps via Nokia PC Suite. It claimed Nokia Maps was not installed on my device. The reason was that, not realizing its purpose, I had previously foolishly deleted the .qf file in MyDocs root.
The .qf file, like ALL important files in MyDocs will be automatically regenerated after removal once the application that uses it is started.
In that case, opening the Maps application on the N900 after the .qf file removal would have prevented any error message from displaying in the Nokia PC suite.
I'll likely go with the combination of sdelete in Windows, and re-flash. I know about "rm", but won't this only remove the "pointers" (allocation maps) to the folders and files -- while with proper tools you can always get the content back if you have time and will?
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My tricorder currently operates on CSSU-Stable 21.2011.38-1Smaemo6.1.
In that case, opening the Maps application on the N900 after the .qf file removal would have prevented any error message from displaying in the Nokia PC suite.