What's structure of the first 28 bytes of each type of record?

>Hello,
>
>I am trying to append from an SDF file that has the following structure:
>-The first line is 1024 characters long.
>-The second line is 28 characters long.
>
>This pattern continues through the whole file.
>
>I want to APPEND FROM this file to a cursor. Does anybody have any idea on how to do this?
>
>Thanks