File output Question

[ERIC HO]

Looking at this closer, I've found the file contains hex '00' between characters. In vim, it displays ^@ for hex '00'. So it looks unreadable. But when I use cat or tail commands, it strips off hex '00' and looks readable. For example. in vim, it displays:

P^@r^@o^@d^@u^@c^@t^@:
With cat and tail, the output displays Product:

Thanks.
Eric

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