Go to list library such as Shared Document -> Library -> Library Settings->Advanced settings->Opening Documents in the Browser -> select "Open in the browser".
However, we run into error listed bellow:
ExcelService.PostProcessRequest: Excel Server Exception: System.TypeInitializationException: The type initializer for 'Microsoft.Office.Excel.Server.CalculationServer.ExcelServerApp' threw an exception. ---> System.IO.FileLoadException: Loading this assembly would produce a different grant set from other instances. (Exception from HRESULT: 0x80131401) at Microsoft.Office.Server.Diagnostics.FirstChanceHandler.ExceptionFilter(Boolean fRethrowException, TryBlock tryBlock, FilterBlock filter, CatchBlock catchBlock, FinallyBlock finallyBlock) at Microsoft.Office.Server.Diagnostics.ULS.SendWatsonOnExceptionTag(UInt32 tagID, ULSCatBase categoryID, String output, Boolean fRethrowException, TryBlock tryBlock, CatchBlock catchBlock, FinallyBlock finallyBlock) .....
In order to resolve this issue, you could try the following procedures.
- Verify Excel Services Application is running correctly from central admin
- Verify Excel Calculation Services is in Started status
- Restart the Excel Calculation Services