Open Attach File Excel

Hello!I’m developing an web application, I’m creating a excel file and this file is attached in a form, but when I try open it, it return this message: “Page not Found”…

Please, help me. Thanks

Subject: Open Attach File Excel

Could you please be a bit more specific here.When exactly is this message received?

Is it when a user has opened the document in a web browser and clicks on the attachment icon?

Or what?