This will be looked at after 1.2 is released. Not sure that was made clear earlier.
We entered feature/rework freeze before this patch was submitted and are now in code freeze. If there is not an existing mantis to sort this in 1.3 I will add one tonight
If you do not know what to do with the file, then it won't be easy (possible) for you to use it.
The file contains source code, which will need merging into the main Mediaportal source code, and then compiling into a format you can run on your HTPC.
It is meant for developers to test/comment on, before it is merged and then made available in the next release of Mediaportal.
You may find someone might be kind enough to do the above for you, and simply provide a file(s) that you can copy onto your HTPC.