Screamer is a Windows software similar to Radio Tray and includes an enormous database of online radio stations. Fortunately that database is an XML file. I have written an XSLT to transform the Screamer database (presets.xml) to the Radio Tray format (bookmarks.xml). I attach the XSLT so you can launch the transformation and integrate the resulting database in Radio Tray.
Ah! you must solve the issue #138 or delete the single quotes from the resulting database.