No. At the hardware level each file is a collection of bytes. But Notepad can make no sense of the bytes intended for MS Word.
MS Word uses some byte patterns to indicate formatting and font information. Notepad is not written to deal with this information and will not work correctly with a file that contains it. This is somewhat like a book written in English and a book written in Latin. The same book shelf could hold both books and both books use the same characters printed on paper. But some readers can only process the book written in English.
A text file is a file that contains bytes that represent:
Text files are the easiest type of files for a program to deal with. Mostly, the next few chapters deal with text files.
What type of file does the program Notepad create?