#command list
<command>
<identifier> [name of this entry] </identifier>
<target-extensions> [the extensions which you want to apply this entry] </target-extensions>
<execute> [program] </execute>
</command>

In <command> tag, $(filename) is replaced to the filename (not fullpath) of the
item and $(dir) is replaced to the store directory. Additionally, $(url) is
the url of the item, and $(filepath) is the full path to the downloaded file
(includes the filename)

Note:
Before executing programs you specify, Aria changes the working directory to
 the store directory of the item. Then programs executed. So you don't have to
 explicitly write something like "cd $(dir); ....."

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PLEASE NOTE THAT I AM NOT RESPONSIBLE TO THE RESULTS OF THE INVOKED PROGRAMS.
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EXAMPLES:
1.automatically unpack .tar.bz2 archive when its download completes,

<command>
	<identifier>untar(bzip2)</identifier>
	<target-extensions> .tar.bz2 </target-extensions>
	<execute> bzip2 -cd $(filepath) | tar xf - </execute>
</command>

2.view image files when downloaded

<command>
	<identifier> view-images </identifier>
	<target-extensions> .jpg .jpeg </target-extensions>
	<execute> xv $(filepath)& </execute>
</command>