Mavericks, MS Excel (2008), Dock
In the Dock, I keep a link to one of my MS Excel (2008) spreadsheets. I've had this for years, and through many OS upgrades. A simple click on the item in the Dock launches Excel and the file opens. Since upgrading to Mavericks, the Dock link (even after having changed the link) now causes Excel to open a copy of the original file, with a slightly altered name (a numerical suffix). This didn't become noticeable until Saving changes - because of the new name, Save becomes, essentially, Save as..
If I open the spreadsheet from its file location (double click the file within the Finder window), the file opens properly (i.e. not a copy, not a new name).
I tried to create a similar situation with files from other applications. They all perform properly. It would seem that Excel is the only app (yet discovered) that has this very unique Dock-related problem.
If you are an Excel user, please report here if you have noticed or otherwise found the same behaviour; or if your tests open the original document properly.
73, Brian
Mac Pro, OS X Mavericks (10.9), 3.2 GHz Quad Xeon w/6 GB RAM; PLUS