thansau_239,

adding the following line to file config_inc.php might fix the issue:
$g_csv_add_bom = ON;

The provided information is not sufficient to provide better help in resolving the issue. A complete and detailed description is required for the support team to get a clear understanding of the problem.

Please explain what you do, what are the results you expect to get and what you actually get.

Also provide detailed, step-by-step instructions to reproduce the issue; the additional information listed below may also be useful:

• Exact version of MantisBT, PHP, Database, Web server, Browser and Operating System
• Relevant customizations (e.g. changes in config_inc.php, etc)
• Installed plugins or custom functions ?
• Was the MantisBT source code modified in any way ?

this issue fixed, thank you very much