I covered this in the last few paragraphs of reply http://www.kixtart.org/board/ultimatebb.php?ubb=get_topic;f=14;t=000468;p=1#000017

Basically:
  • The creation of temporary directories is not supported.
  • Overwriting existing files is not supported.
It may be supported in a future version.
When script finishes running, the files that the script created are removed.

The only files which will not be removed are:
1) Additional files your script has created when it run.
2) Files that KiXcrypt has no permission to remove, because they are still in use or permissions have changed during execution.
3) Files left because of an abort.