As far as I know, Adobe AIR based applications are not able to change these attributes of files. They are read only in the API. I may at some point in the future add some additional features that require a 'native installer', which would give Zeeb the ability to run command line type things which might work. I would add it for things like being able to call mkvmerge/mkvinfo, etc. to get details about a particular file, such as audio tracks and subtitles, but this is just in the idea stage at this point.