I am replacing a colleage for the support of a SharePoint 2010 intranet.  

I need to modify a InfoPath form.  

I get an error message when I try to download a copy of the form template from the intranet.  

The message informs me the file can not be open.  

I have checked my permissions on the form template and I have got the "Full Control" permission level on it. 

Any help will be greatly appreciated