To prod back, you have three source code files---one is in Word Perfect format from 1987. The second is from Microsoft Word from 1998. The third is an ASCII text file from 1972. Which one can you open and reuse today?
None of them! The ASCII file might be legible, but then it turns out that you don't have the correct build environment or all the dependencies, so the code isn't useful to you as-is.