i want to know one thing as in stad we can open the higher version file in lower version. but in the case of ceaserII we can't open. i had some file in ceaserII 4.5 version but i have to open in 4.4 version. but it is not opening. even i converted the file into neutral file. still it is not working

can any body help me how we can open this file
i will be very thankfull to you

regards
ramaswamy