What do you even mean by that?
The text program obviously can’t process and play the audio, it will try to open the file as if it contains text.
But it’s not like opening the file destroys it. You can still just close the text program, and then open the file using a suitable media program instead.
Here’s the thing: Let’s say your text editor interprets the file as ASCII.
Several characters in the ASCII table aren’t printable. The first 32 characters in the table are control characters, so they don’t get displayed on screen as text you could copy and paste. So if you opened an audio file in a text editor as an ASCII file, copied the text, pasted it in another text field, then saved that file, any bytes that were between 0 and 32 decimal would be missing.
