By Anton D. Nagy | May 27, 2010 11:57 AM
If you are running a stock ROM on your HD2 that features Sense 2.5.19211619.0 you can now have a nice tweak that will show your week-end days in Calendar tab colored, namely blue for Saturday and red for Sunday.
Until (hopefuly soon) a CAB comes out, you need to download and extract the contents (two manila files) of the archive and overwrite the originals on your Device’s Windows folder, followed by a Soft Reset.
If you are running different Sense versions (check by sliding to the Settings tab, About phone, Software information) check back to the thread over at XDA to see when a compatible version comes out.
(Source: XDA Developers)