Error on Edit Power Point Files

[Haroldo Nascimento]

Hi,
I attached a power point file at the confluence page. I use the Microsoft Power Point macro to view and edit.
I can see it, but when I try to edit it takes the following steps:
1- Download file on my machine
2- I enable file editing in power POint
3- After editing, I try to save and I get the message "It is not possible to save"
Important: In my colleague's environment I can edit using the same user.
What could it be ?
Note: I use Confluence in a Server Environment (local)

Thanks