tuant,
This isn’t a MyEclipse or even Eclipse issue, the files were likely checked in incorrectly into the repository in the first place (as text). I’ve run into this problem many times with my team, and it has always stemmed from someone checking files in incorrectly.
You will need to go back and erase those files from the project, commit the delete and then check them all back in AS binary. Eclipse has very good CVS support and should take care of this for you transparently.