Add extra cutsom info to to file Like QFIleInfo

[hatewarning]

I want to add my some own custom information to file like author, author bdate like this.
Is there any way to do this

[SGaist]

Hi and welcome to devnet,

If you are thinking of adding meta data to any file type, please read this "thread":http://qt-project.org/forums/viewthread/28329/

Otherwise you should be more precise

[hatewarning]

appending file info at end is not good.
If user share file with other it will be corrupted file so .
Is there any other way?
is there way to add info to attributes not to content of file>

[SGaist]

As said in the other thread, it all depends on the file format