How to make file association (not with CLI tool/command)?
Yes, there is. Right click the file and select open with. Or right click and select properties, open with and select the application you want to associate with.
right click on the file. select "properties". click tab "open with". there you have the button "set as default".
it took a while to figure it out, I think it was more intuitive in natty, but there you have it anyway.