Thanks for your response Kirk. Given that the catalog can't be automatically updated, it seems to make sense to only send an image to the external editor from the browser, not from the catalog. To simplify this process, is there an easy way once an image is selected in the catalog to open it in the browser? If so, it could then be opened in the browser, sent to the external editor, returned to the browser after processing and be added easily enough to the catalog. At present, the only way I can see to open the image in the browser after finding it in the catalog is to read the file path and then drill down in the browser to locate the item. This is a frustrating, time consuming process - but perhaps I am missing something?