Mo, I have tested this before and just tested it again to double check and I can get the Attachment Relate Info Window Widget to work with lines.Here is an example of what I have in the main config.xml: <operationallayers>
<layer label="County Roads" type="feature" visible="true" alpha="1" useamf="true" mode="onDemand"
info="widgets/InfoTemplates/AttRelateInfoWinWidget.swf"
infoconfig="widgets/InfoTemplates/IWT_Roads.xml"
url="http://myserver/ArcGIS/rest/services/myservice/MapServer/5"/>
</operationallayers>
And the contents of my IWT_Roads.xml<?xml version="1.0" ?>
<configuration>
<fields>Surf_Type,Name,Classification,County_Maintained,Road_Id,Plan_Hyper,Deed_Hyper</fields>
<titlefield>Name</titlefield>
<layername>County Roads</layername>
<links>
<linkfield icon_or_text_or_img="icon" icon="" linkalias="" linkprefix="" linksuffix="">Plan_Hyper</linkfield>
</links>
<datefields></datefields> <!-- field in milliseconds -->
<zoomscale>150000</zoomscale>
</configuration>