HELP NEEDED

[kod...@libero.it]

Hello, I'm sorry if I'm writing to the wrong email adres but i can't find the 
support email adress. i need help! i saved last night an odt file 28 apges long 
terribly important to me and now when i tried to open it it asks about the 
ASCII FILTER wich i have no idea what it is. how can a solve this problem? 
seraching in the net i found no solution... please help me or at least tell me 
what email adress i should write to.thank youmarco datola