Encrypted file

[Rajiv-Ranjan <rajiv () ncb ernet in>]

Hello folks,
        I received 1 very sensitive file with extension ".ppt". Whenever I 
am opening this file in OpenOffice or MS Power Point its showing totally 
cypher character like ####.#####,%5%^&###DFG%CB&*^&########. 
        How can i decrypt this file and how to know the actual content of 
this file, Is any share or freeware tool help me. This is very important 
to extract the content of this file. But How Can Any Idea ????




Regds......
Rajiv Ranjan
NCST(now C-DAC)
68-Electronic City
Bangalore,560100
9886085012
080-28523300
www.ncb.ernet.in/nag