Windows 7: How to install a language pack?

I have got an unofficial danish language-pack for ver 7127, but I don't know how to install it?
It is a file called lp.cab.

No setup or anything, so how do I do it?

Start>
Control Panel>
Windows Update>

the menu on the left will have an option to - Check for updates
or incase you downloaded the updates already and haven't installed them, click on - Restore hidden updates.

Czech Language Pack - Windows 7 Release Candidate for x64-based Systems (KB967828)

Download size: 47.6 MB

Update type: Optional

After you install this language pack, you can change the display language of Windows 7 to be Czech.
Go to the Clock, Language, and Region category in the Control Panel to change the display language.

More information:
Windows 7 language packs are available for computers that are running Windows 7 Ultimate

Help and Support:
Microsoft Help and Support

No, it is a file I have got via torrents, as it is a languagepack for build 7127 it is not on windowsupdate. I have Windows 7 running, and this single file lp.cab, that contain the danish language, but I don't know how to install it, so I can choose danish in controlpanel.

Found the solution. Don't unpack lp.cab, but just go to languagesetting in control panel, and then browse to the lp.cab, and Windows does the rest by itself.