Need help- notepad file through serial communication

I am working on a dot matrix printer.Its LX-300 . I am trying to replace the company circuit board with my own atmega32 controller based circuit board and using bascom compiler. I want to send a notepad text file using serial port to print some text.

let me explain you! obviously its a dot matrix printer that’s why we need to define all characters so I defined the characters A,B,C,…1,2,3,… in atmega32. When i switch on the circuit then it directly prints the all characters that i defined in atmega32. Now i want to print it using a notepad file through serial communication. sorry i am newbie that’s why its very difficult to explain.