without getting into a discussion about if this is a bug or not a bug
... let me tell you this:
* I generally agree with the notion that "updating" files should in some way be possible
* You may have noticed that the filer manager was one of the areas that has been improved with the latest release. I will continue to improve the file manager for our next release.
* Without promising a full blown versioning implementation: i will improve on this for the next release. Needs some more thinking on my part