If the --lsbsysinit option is not given then the names must consist entirely of upper and lower case letters, digits, underscores, and hyphens. If the --lsbsysinit option is given, then the names must not end in .dpkg-old or .dpkg-dist or .dpkg-new or .dpkg-tmp, and must belong to one or more of the following namespaces: the LANANA-assigned namespace (^[a-z0-9]+$); the LSB hierarchical and reserved namespaces (^_?([a-z0-9_.]+-)+[a-z0-9]+$); and the Debian cron script namespace (^[a-z0-9][a-z0-9-]*$). You could either modify your host''s crontab configuration to execute run-parts with the --lsbsysinit option, or make use of some other system for creating these files with the cron type, eg by substituting a "." for a "_".