If I open AD, then open a number of files, each file is shown in its own tab - excellent.
If I select a .afdesign in Explorer, it opens as expected. However, no more files will open.
Typically I want to open two (or more) files simultaneously from Explorer - I find it easier to use the Explorer interface than application interfaces (not just AD). In AD only the first file selected opens. I have to go into the AD instance and open any further files from inside the app. Since, as others have posted, the folder chosen by AD as its initial search location is not necessarily the last accessed folder (haven't tried to get my head around the logic here yet!) this operation can waste a lot (relative) of time. It certainly adds to the "melting ear wax" syndrome ;)
It would also be nice if all working files could be closed in AD without closing the app. (cf CorelDraw!).