Set Default Excel Instance to 2007

It should be done for all Excel file extensions.
i.e. for XLS -
from command line: "assoc .xls"
Then if you can see the result (i.e. .xls=Excel.Sheet.8)
"ftype Excel.Sheet.8"

If it points to your Excel 2003 you can change the path to new one:
"ftype Excel.Sheet.8="C:\Program Files (x86)\Microsoft Office\Office12\EXCEL.EXE" /e"

i tried that
now it shows as office 12

but my problem is not solved
when i run excel from command prompt it still open excel 2003 instead of excel 2007

basically i am using interop.excel in my .net program
which create excel 2003 instance because 2003 is the default excel version
i want to change it to 2007 so from code also i may get the same

What command prompt are you using to run your excel?

from start menu -->Run

in that dialog box write "Excel"
it will open 2003

Do you have some office folders in your "PATH" environment variable?

Try running:

"C:\program Files\Microsoft office\office12\excel.exe" /regserver
from the run box and see if that helps.

it works from run menu
but still in my vb.net code i am getting version as 11
so now i may have to move my question to different zone

Thanks