Problems when i need to see a document in sharepoint from mac os x

Hi to All of you,
From a Mac, with Office for Mac 2011, I am trying to access files from SharePoint 2010, I checks out the file directly from SharePoint from Safari or Mozilla, then when I try to open the documents (.xlsx or docx), it directly sends me an error through the Upload Center (Failed. Open the file to the error):
How can I solve this to ensure I can edit the documents directly, without downloading them through the Upload Center from a Mac? Can this be disabled?
 
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and this tries to open the Upload Center (which I understand open files offline only)
 

pic2

Thank you
Tania
CarloAsked:
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Ted BouskillSenior Software DeveloperCommented:
You have to download them because the component used to edit in place is for Windows and IE only.  If you run the IE plug-in for FF on Windows you can do it, but once again not on the Mac.
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CarloAuthor Commented:
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