How to fix 'Microsoft Excel cannot open or save any more documents'

Question

I am running C# ASP.NET 4.5 web application on Windows 7 64-bit using IIS 7.5. The application pool it uses has the name \'ASP.NET v4.0\' and its identity is ApplicationPool

Answer 1

Right click on the file with file explorer, choose Properties, then General tab and click on the Unblock button. This error message is very misleading.