I opened a php file with composer and ended up having to re-code that file using my original editor because in a number of places the source had been changed without my deliberate intervention. Ugh. Looks like some wizard tried to tidy my code but just screwed it up.
It also added blank lines throughout!
It doesn't preserve files as is. Incidentally, this is a KompoZer question, not a portable one.
Sometimes, the impossible can become possible, if you're awesome!