Should return a unique GUID for this accessor's file type icon that distinguishes it from any other icon. This should not be the same as the accessor GUID. See the comments for GetAccessorGUID() for instructions on how to generate the GUID. The icon's 20x20 GIF file should be placed under your imageserver installation, at plumtree/portal/public/img/sml{iconGUID}.gif.
unique GUID for the accessor icon
IPTCustomFileAccessor Interface | com.plumtree.server Namespace