Spool to Excel - Wrong format

Dear All,

I have scheduled a background job for IW37N in custom report to generate the spool.
And trying to download the spool data into excel file.

I am using following FM.

RSPO_RETURN_ABAP_SPOOLJOB
cl_gui_frontend_services=>gui_download

But the issues is excel file is not coming in proper format. Excel contains '|' after each data.

Could you please help?

Thanks,

Arpita