This free tool by Autosofted can allow you to compare two different text or doc files and will show you of the differences between those 2 files. The program will highlight the line that it detects the change on, and also display short messages that specifically inform you on which word(s) changed. The program can perform the full comparison of both files and provide a small detailed report all in less than a minute.

This utility is also very simple to use, you just need to select 2 files and click 'Compare'. You can also filter your results to only show changes done on one of two files. This tool is completely free to download.