Duplicate workbook

[Beans]

I have a workbook, that, when openned, opens a duplicate copy. The
sheets are given the following naming convention:
Workbook.xls:1 and workbook.xls:2.
All changes done in one goes to the other.

What was activated to enable this, and how do you turn this off

TIA

 

[Max]

Its just 2 windows. Click Window > Arrange > Tiled (say) > OK
This will arrange the 2 windows side-by-side. Then just close one of the 2
by clicking the "x" at the top right corner, then click to maximise the
remaining window.

 

[Dave Peterson]

You actually have two windows into the same workbook open
(caused by window|new window)

click on the window you don't want and hit ctrl-w to close it.

remember to save the workbook--or you'll have to do it again.