Wrapper for a Background job

All,

We have a standard program which has been scheduled as a monthly batch job. The output for this program is being sent out as an email automatically.

Now, the requirement is to sent out this output as an excel attachment instead of html attachment. I am planning to build a wrapper for this job.

Please help me to achieve this requirement where i would still be able to schedule this as a monthly batch job and send output as an excel attachment.

Thanks for your help.