In this post I am going to show you how to build your first Boxee Application. For now we will keep it simple. This App will use an RSS feed generated by Youtube (just like I used in my previous post, adding an rss feed to boxee)

The first step is to find the directory where Boxee stores files for the different Apps. This varies depending on your operating system.
on OS X/AppleTV
~/Library/Application Support/BOXEE/userdata/apps
on Linux
~/.boxee/userdata/apps
on Windows XP
C:\Documents and Settings\[username]\Application Data\BOXEE\userdata\apps
on Windows Vista/7
C:\Users\[username]\appdata\Roaming\BOXEE\userdata\apps

In this directory you will see a folder for each application that you have installed in Boxee.
For this app I am going to use the TourismIreland Youtube channel as my source. The link to the RSS feed for this channel is:
http://gdata.youtube.com/feeds/api/users/TourismIreland/uploads?orderby=updated&alt=rss
In the apps directory that you have open create a new folder called TourismIreland.
Within this folder create a file called descriptor.xml with the following content:

<app>
<id>TourismIreland</id>
<name>Tourism Ireland</name>
<version>1.0</version>
<description>Watch Videos from Tourism Ireland</description>
<thumb>http://dir.nexthop.ie/apps/tourismireland/ti.png</thumb>
<repository>http://dir.nexthop.ie</repository>
<media>video</media>
<copyright>dkane</copyright>
<email>info@nexthop.ie</email>
<type>url</type>
<platform>all</platform>
<minversion>0.9.5</minversion>
<url>rss://gdata.youtube.com/feeds/api/users/TourismIreland/uploads?orderby=updated&alt=rss</url>
</app>


All that is left to do is add the application to  Boxee.
To do this launch Boxee, go to Settings > Media Sources >Manually Add Source
In the Source Name field type  TourismIreland
In Source Location type app://TourismIreland
and select Video from Source Type
Click Add.
Your new application should now be available under Applications > Video