Thanks all (especially to Ltr for total precision). I got most of the misc ebooks from various sources now under Calibre management. (It won't pick up those 100 freebies off the Kobo device--but no matter on that point.)
I find the Kobo bookstore/ADE use of "URLLink.acsm" non-intuitive. Downloaded files appear in the status bar of my Firefox, so I see downloading when it happens, but when I clicked to open the ACSMs, books appeared in "Reader Library." That had different content than ADE but I forgot that app is the Sony reader app.
(Aside: A lot of what Microsoft did to make DOS/Windows easier for Aunt Susan made it clumsier for people who grew up on CP/M, DOS, etc. Like MS inventing "My Documents" to mirrors some but not all of the files in C:\Users\username\My Documents\ especially C:\Users\username\AppData\Local. Sometimes you need to unlock the door to the subbasement to get things done in Windows.)
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