Error with export account hierarchy

[Cristian Marchi]

I received a report from an Italian user that is not able to import in 
GnuCash 2.4.13 an account hierarchy exported with the same version. He 
gave me the exported files and I'm also not able to open it getting an 
"error parsing the file". At first look the file seems o be good. I 
attach the file if you want to test it.

Can someone explain what's wrong?
Thanks
Cristian
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