Application.Width = 75% of Stated Screen Resolution. What is causing this?

Hi,

By opening up my screen resolution in Windows, I can see it is set to 1680x1050. I can confirm this using

Please Login or Register  to view this content.

However, when I expand my Excel Window to full size and check it with

Please Login or Register  to view this content.

I get 1272. Similarly, the application height is 745.5. These are both close-but-not-quite to 75% of 1680/1050.

By manually resizing the window so that it APPEARS to fill the whole thing, I get a width of 1260 and 787.5, which are both which is exactly 75% of their intended dimensions

Why is this happening? I need to be able to detect it so I can code to accommodate it on other people's machines.

Thanks