Alternative Solution

Issue Summary

Audit File is a great module for the file permission problem I had. However, not supporting D6.x had me searched for other work out.

Here is an alternative solution to regain file ownership and permission which I found on the net and believe useful to share here:

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Execute the following code within any content type with php filter on (ie. copy and paste this into a Drupal page, set input format to "PHP", and save the page). Be sure to delete the page as soon as you are done!

A common place this snippet applies to is the files/images directory.
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In my experience, the directory should begin with the root of your drupal install. e.g. you have installed drupal in the path /public_html/drupal and your orphaned file located at /public_html/drupal/sites/all/files/images, then you should put in:

Remeber to put on the php filter. Hope it helps.