qnxinstaller, changed files destroyed when uninstalling a pa

QNX PE 6.2.0A, FS_PKG 2.1.3

I have installed a package and edited some configuration file, which is
in content of the package.
I want to uninstall the package, keep the edited file and install a new
version of the package.
After running qnxinstaller and uninstalling the package the edited file
content is destroyed.

QNX Software Installer

Choose package => Uninstall

Looking for spilled files
File Conflicts Detected
Keep All
All files will be kept

Continue, Done

Now, the edited file content is destroyed.