Mar 14, 2012 at 8:48 PM
Edited Mar 14, 2012 at 8:50 PM
There is no file called "excel.dll" that I know of.
If you have successfully run the Excel 2010 Primary Interop Assemblies (PIA) installer that you linked to earlier, you should have a directory like this:
with a file inside called:
Microsoft.Office.Interop.Excel.dll (1 550 200 bytes)
You should check this from a command prompt, and not via the Windows Explorer (which has a special display handler for the GAC).
If you don't have this file, then your installation of the PIA installer must have failed, and you can check for an install log or event log entry or something. I think you should investigate.
Otherwise, using NetOffice is not an alternative to Visual Studio. It's just a set of libraries that give you alternative interop assemblies to the version-specific Primary Interop Assemblies.