Changes
Missing > and quoting
Basic install:
<package id="irfanview" name="Irfanview 3.93" revision="1" >
<check type="file" condition="exists" path="c:\Program Files\Irfanview\i_view32.exe" />
<install cmd="'\\server\software\irfanview\iview390.exe /silent /folder="c:\Program Files\Irfanview" /desktop=1 /group=1 /allusers=0 /assoc=1"' >
<exit code="0" />
</install>