Tod666
Pretty sure the file name should be relationships.rpy
When you right click and choose "save as" it generates this as a save as name;
971884_relationships.rpy.txt
The save file name will be highlighted so if you just type in relationships.rpy the file will be saved as "relationships.rpy.txt"
Now right click on it and select "Rename".
Delete the ".txt" at the end and save again.
When it warns you about changing the file type, just click "Yes" and your file will be saved as "relationships.rpy".
Now just copy your relationships.rpy file into the "game" folder (as usual) and select to replace the original "relationships.rpy" file that's already there and you should be good to go.
Enjoy. Hope this helps.