trouble with program that i cant figure out

[B.D. M.]

downloaded email document but when opened it is a bunch of symbols and 
unreadable. what is the problem and how to correct.
I purchsed openoffice because my computer didnt have microsoft word or excell, 
and for the most part openoffice is working just fine but can't read anything 
from my email downloaded. I have gone to help but can't get answer.( help) also 
i deleted a file by mistake, can i get it back, how. I tried to look up this in 
help but could not find answer. Thank You