how to add carr return and tab in email attchm ?

Hi Guys iam

sending an email using SO_DOCUMENT_SEND_API1

I am converting my attchm in the foll way

CALL FUNCTION 'SO_RAW_TO_RTF'

TABLES

objcont_old = text_content

objcont_new = text_content

EXCEPTIONS

others = 0.

The problem is my text file attachmnt is coming in the email as

field1field2field3val1val2val3....

I would like to add a crg return 0D0A at the end of field3 and each val3, and a tab 09 in between all the value, the problem is that when I try to do that i get an error.

Can some one give me an example or a clarification?

rgds

sameer