This free online service converts online file formats from one to another.
You can use it to convert .docx to .doc
http://www.zamzar.com/
You can use this free online converter:
http://www.coolutils.com/Online-Image-Converter.php
You can use Notepad++ which is a very good free text editor.
From its "Search" menu go to "Replace" and then in the "Find in files" tab.
jConnect messenger can play these files.
This article will show you how to convert DVD to other video formats and edit DVD; it includes the following four sections:
1 How to convert DVD to AVI, MPEG, WMV, MP4, MP3, FLV, MOV, etc?