Fix issues with opening an excel file in SharePoint Office Web Apps

If you have issues opening an excel spreadsheet in office web apps (OWA), please continue to read:

Problem: "This workbook cannot be opened because it is not stored in an Excel Services Application trusted location. To create an Excel Services Application trusted location, contact your system administrator."

Solution: Go to Central Admin - Excel Services Application > Trusted File Locations and the default entry for address https://, Location Type: Microsoft SharePoint Foundation, Trust Children had already been created.

Problem: Unable to open excel sheet

Solution: - Go to central admin - Security - Configure Service Accounts - Select Windows Service - Claims to Windows Token Service - Change the account from Local Service to Farm Account.

- Central Admin - Excel Services Application - Global Settings - File Access Method - Select Process account.