Certainly not from DEC. DEC had a powerful "RMS" (record management system) later between a program and the disk. That later would take files in a balloon formats and convert them as needed.

For example, you could define that your file was fixed length records (like the old punch cards); at that point each line doesn't have a line separator at all; the \n or\r is not stored on disk. But when you read a line using the C routines, one will be added.