How to create my dwl.dwl?

Hi all!
I work with OpenAT 3.10 and DWL.DWL v2.12
I have some problem with existing downloader. Sometime I receive MEMORY ALLOCATION ERROR or END OF DOWNLOAD. Sometime I can not break transmission by sending CAN CAN CAN characters. Xmodem is not a good protocol for my application.

Can I create my Downloader? How to say compiler to create an application with “DOWNLOADER” word and other special information in DWL header.