How to edit doc/pdf file on browser

I want to achieve below things:-

1. User can upload a doc/pdf file (it can contain anything like code, text, images).

2. After upload he can view the doc/pdf file on the browser in next section and when he click edit button in the browser screen he can edit the doc/pdf file and save it again in doc/pdf format

The first task is done through php file upload and with the help of GOOGLE DOCS VIEWER.

In the second task i used different libraries (third party) which are available like :-

PHPWord ( but it not gives editing facility)

Normal file handling (no success)

I tried Zend LIVEDOCX plugin (its free for sometime and that's why i cannot use it for longer time period). I am able to read doc file and convert it to HTML and show it in FCKEDITOR.

The last problem how can i again save this edited data coming from FCKEDITOR into doc format again?

Note:- Code is not required. Any help is appreciated.

Also if its possible to do it in any other way (conversion and editing) tell me also that.

If anyone thinks that any code snippet is needed, let me know.

Thanks.