My problem is:

I've opened a file, from my server, AND I've set the  filename to Nome.xls (example).

when I save the file in Sheet Editor, the generated file is a randon name, like  1266599308448_12001000006853433.xls

But I need to save the file with the especified  filename.  Everytime that I click in the SAVE BUTTON, another file is generated, and I need to update the opened file, for example.

How to solve it?