LÖVE

Tested on Ubuntu Intrepid Ibex.

Instructions:

1. Download the mime file below
2. Copy/Move the file to /usr/share/mime/packages/
3. Run (as root/with sudo): update-mime-database /usr/share/mime
4. Restart nautilus (kill it, restart your session, or restart your pc)
5. Assign love to the .love files (right click->Open with application find love, or add it manually)
6. Enjoy!

For the icons:

1. Download the icon below
2. Copy/Move it to /usr/share/icons/gnome/scalable/mimetypes/
3. Run (as root/with sudo): gtk-update-icon-cache --force /usr/share/icons/gnome
4. Restart nautilus (kill it, restart your session, or restart your pc)
5. If love files are assigned properly (as done above): Enjoy!

If this doesn't work, try and do the same, but in /usr/share/icons/<theme name>

Both steps at once:

1. Download both files below
2. Copy/Move the xml file to /usr/share/mime/packages/
3. Copy/Move the png to /usr/share/icons/gnome/scalable/mimetypes/
4. Run (as root/with sudo) no quotes: "update-mime-database /usr/share/mime; gtk-update-icon-cache --force /usr/share/icons/gnome"
5. Restart nautilus (kill it, restart your session, or restart your pc)
6. Assign love to the .love files (right click->Open with application find love, or add it manually)
7. Enjoy!

And this does not result in normal .zip-files being opened with love?

No, it defines a new mime type, icons would be nice though (none included in package)

Any common way to automate this in the .deb?

Include the mimetype file (and preferably add an icon) and run update-mime-database in the post-install script?

Here are the icons, if you would like to add them.

The "Vista" ones contain 16x16, 24x24, 32x32, 48x48 and 256x256. The non-Vista ones contain all those except 256x256.

The game-icons should be used for the .love files. The love-icons are meant for the binary itself, but I don't know if there's any point in adding that.

Whoa, wicked useful! Thanks for this!

@rude found out how to change icons, updated first post.

I can create a shell script for the time being, should I?

I'd use it. I was waiting until the next version with this built-in, but I definitely wouldn't mind just quickly downloading a bash script and running it.