Is it bad that I changed the default application of application/x-trash files?

I was trying to use the mimeopen command to open an image file. I ended up being asked to pick the default application of application/x-trash. I was practicing python and thought I should press control c to cancel. Well now the default application of the application/x-trash files is ^c. Now I'm wondering if the that's a bad thing and if so how do I change it back to whatever it was.