Charecter set issue

Database
Enthusiast

Charecter set issue

Hi,
I am using following code in bteq script to generate the sql output to a file.

bteq<<END
.set session charset "UTF8"
.export file abc.xls
Select emp_no, emp_name from emp;
.export reset
END

When I open the file in UNIX OS, i am able to see Japanese charecters or UT8 charecters in column emp_name.
When I sftp or send a mail from unix, the same report, those charecters are not visible.

Tried generating the same report through fast export. The issue is same.
i tried as fexp -c "UTF8" < fexp_script
Do I need to do any change.
Quick response is appreciated.

Thanks in advance.