int n = sThumbnail.indexOf("thumbnail/");
if (n == 0) {
String sFileName = sThumbnail.substring(10);
if ((sFileName.length() > 0) && (sFileName.indexOf("/") == -1)) {
String sId = sourceItem.getProperties().getValue("id");
String sUrl = con.makeSharingUrl()+"/content/items";
sUrl += "/"+AgpUtil.encodeURIComponent(sId);
sUrl += "/info/thumbnail/"+sFileName;
provider.add(new AgpDPart(
con,sourceItem,sUrl,"thumbnail",sFileName,-1));
}