Hmm I think my second question shouldn't be even asked. Its logical, when the plugin's user renames tracks as they are in discogs' database, the title of the track will be changed and therefore catid in the file name will be removed. But could use the question related to the first one which im still interested for (same post) anyway - whats up with those catids (in file names) from the releases or (unreleased) tracks that are not in discogs database? If they are not in the discogs db you have 2 solution: - You manually tag them using the Properties dialog - You submit the new release to the discogs db using their online form, then use the plugin to fetch the new data and tag. If a release is unreleased you can probably just save a Draft and enter its url in the plugin for tagging. For renaming you use the File Operations functionality provided by foo_fileops.dll. I don't think it is installed by default, you may need to rerun the foobar installed to have it. If it is installed when you select track you'll have a "File Operations" submenu in the contextual menu. You can then use a custom tagz expression to rename your files. For example I use:$meta(discogs_label,0)/'['$meta(discogs_catalog,0)']' - %album artist% - %album%[ '('disc %discnumber%')'][ - %date%]/%track% - %artist% - %title% which provide paths like this: a.r.t.less\[A.R.T.LESS 2201] - Don Williams - Detroit Black EP - 2006\01 - Don Williams - Orderly Kaos.mp3