Opening a file opens an extra file

[Bob Stringer]

I have Word2000 (with all updates) on WinXP SP2.

For several weeks now, when Word is not already open and I
double click on a Word file to open it, Words launches, with
*two* files open -- the one I double clicked on is in the
back, and a new blank file is in front (i.e., active).

I assume that I inadvertently changed a setting to require
Word to open a new blank document every time the program
launches, but I don't know what I did. I couldn't find
anything in the Help file, and nothing in Tools | Options |
General tab looked relevant.

I'd appreciate advice on how to just have the file I double
clicked on open when Word launches.

Thanks.