Windows Print Server 2008 Migration - Concatenating .spl files and trying to print, results in the job not being submitted to the queue.

We are in the process of migrating from print server 2003 to 2008 and have an existing .bat file that has commands to combine a few hundred .spl files into a single .spl before releasing it to the print queue. This script was a simple COPY command and an lpr in 2003.

We replaced the COPY command with a FOR %I IN (D:\*.spl) DO TYPE %I>>  D:\WHOLE.spl

The files are now all appended into a single file, however, we are unable to submit it successfully to a print queue via 2008 R2, almost like the file format is not supported for printing.

This approach works well with 2003, however. 

Are you aware of any workarounds for such a situation?

Thanks!