The operation of DansGuardian is extensively configured through various lists (sites, URLs, extensions, etc.). There is just one system-wide copy of some of these lists, while many others have a different copy for each filter group. This tool allows you to select one of the system-wide lists and then edit it.
New files named in this way will be given the same file access permissions as their parent list, and will be searched at the same time as their parent list. If you create a new list file but name it some other way, searches may not find items in the new file, and Webmin permissions may not allow you to edit the file, effectively making it useless,