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I doubt this has anything to do with windows 10 -- its probably a side-effect of calibre moving to running file open dialogs in a separate process to avoid crashes caused by broken windows shell extensions many users have installed on their systems. Probably can be fixed by giving the process used for the file open dialogs the same app user id as the parent process. However, note that recently used items are available in the viewer already by right clicking the open button.
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