Clusters.txt is a file with 511 DXClusters in it by alphabetic selection, job done by Dan, S50U. You can get this file in DOWNLOADS sections of S50CLX DX Cluster home page http://s50clx.infrax.si with instructions how to update N1MM program inside the ZIP file or it can be downloaded directly from N1MM Contest Logging Software website world's most popular free software for Phone, CW and Digital Modes under Additional Support Files. CUL Dan, S50U