New line tokeniser.

[dedndave]

I can give you an example of text files with data beyond the text
when you save a registry (.REG) file from RegEdit, you will see binary data following an EOF (1Ah)

[sinsi]

Never seen an embedded null (00) in a text file.

Creative Labs (the Sound Blaster people) had an audio file .VOC which started with a header

Code Select Expand

sig db 'Creative Voice File',1ah

Legend has it that people would use 'type' to try and listen to the sound.
Who knows, in the good old dos5 days commands sometimes did weird things...

[dedndave]

you could use
copy/b file.txt con
similar to type, but treats it as a binary file
not that it will create sounds - lol