Alfresco Share incapable of previewing text files including japanese characters

[tinlinnnsoe]

I have been customizing the Alfresco 4.0d Community version and used "Share" for document management.

Now I am facing the document previewing problem in document detail page. After uploading a text file including japanese characters encoded character set with UTF-8, the file shows on the preview is garbled. Janpanese characters in text file are not displayed correctly on the preview.

But preview for Excel, Word and Pdf document types is okay and can be previewed correctly. This problem is only occurred in plain text file previewing.

My current development environments are as followings:
Alfresco Version: 4.0 d Community Edition
OS : Cent OS 5.5
Web Server :Apache Tomcat 6.0.35
Database Server: PostgreSQL 8.4
Browsers: IE8, Firefox 30
Browser Addon: Adobe Shockwave Flash Object 14.0.0.176

So, let me know that Is there a way to solve this problem.Any help, would be much appreciated.

[mrogers]

IIRC fixed long ago.   Is there a reason for using such an old version?

[tinlinnnsoe]

There is no special reason. Because I customized and used the alfresco since 2012. At that time, 4.0 d is official release. So I customized the source of 4.0 d.

Now I already tested using 5.0 a community edition.
This problem is not occurred in 5.0 a version.

So, what are differences between them?

[tinlinnnsoe]

If anybody have same problem, please share how to solve this problem.