We just moved from Office 2003 to 2010, but stayed on Windows XP. My Personal.xls has been converted to Personal.xlsb. With a few minor glitches, everything has run pretty well. This problem is more of a "Weird" thing than a true problem, but it has me concerned. Every time I open Excel, PERSONAL.xlsb shows up in My Recent Documents. I can delete it from my recent documents, but opening Excel puts it right back. I never noticed this behaviour with Personal.xls.

Is this just a "feature" of Office 2010 I'm unaware of?