I need help creating my first .jar file from a small working Java program that I’ve created.<BR><BR>In a nutshell, my program reads in a data file (input.txt) located in the same folder as the .class ...

You have to add it to the classpath somehow. Move the file from c: to a directory that he has permissions on and then edit the classpath. If he's running the project inside of an IDE then you can "add ...