Unable to Open File: Error on Importing Flash File with Adobe CS5

Hi guys,
A problem with software flash presentation sample. My group mate handed his flash presentation work sample and while importing the flash file in my laptop with multimedia application Adobe CS5 flash, an error occur saying unable to open file. I am using Windows 7 operating system. What is the main reason of the error? How to resolve this issue?
Expecting some help, thank you.
