从数据库导出到Excel文件,文件中中文显示乱码！

打开该文件的时候提示该文件或者有错误,或者不是SYLK文件格式

代码如下，请大家帮忙看看
dim rs,sql,filename,fs,myfile,x,link
sql=request("sql")
Set fs = server.CreateObject("scripting.filesystemobject")
filename = Server.mappath("file/online.xls")
if fs.FileExists(filename) then
fs.DeleteFile(filename)
end if

set myfile = fs.CreateTextFile(filename,true)
Set rs = Server.CreateObject("ADODB.Recordset")
' sql = "select * from 首页推荐"
rs.Open sql,conn
if rs.EOF and rs.BOF then
else
dim strLine,responsestr
strLine=""
For each x in rs.fields
strLine= strLine & x.name & chr(9)
Next
'response.write strLine
' response.end
myfile.writeline strLine
Do while Not rs.EOF
strLine=""
for each x in rs.Fields
strLine= strLine & x.value & chr(9)
next

myfile.writeline strLine

rs.MoveNext
loop

end if

rs.Close
set rs = nothing
conn.close
set conn = nothing
set myfile = nothing
Set fs=Nothing