Open a file on the desktop

How do you open a file on the desktop? I tried this

Workbooks.Open Filename:="D\Days\Monday.xls

but it's not working.

Oh, I figured it out!! I used

C:\Users\amartino\Desktop\Days

but now it says excel cannot access days, the document may be read only or encrypted. How do I get around this?

Oh, now I got it to work, I had to add the name of the file (duh!!), but there was an error when I added ".xls" at the end. Why is this? Also, it came up minimized? Why would this be? Thanks.