Hello again,
The problem that I described above is related with an issue with Microsoft online viewer for Office documents. The viewer doesn't work with documents containing accents and diacritics characters in the filename.
To solve the issue I created in client side a Javascript function to remove these characters and I deleted all records from the "FileCache" entity to guarantee that I didn't have any document with a wrong filename in this entity.
I hope this is useful to other users of this component.