A skiplist is a type of data structure like a binary tree, b tree, balanced tree..... Your question is meaningless without the context of *what* created the data structure and serialised it to disk. How do you create the db files from scratch no prob without the ability to read them? I assume it is cyrus related in which case you need to look at cyrusdb_skiplist.c, and RTFS for details on the file format so you can hack together a widget to extract the data. If you want more functionality you are looking a buliding a full blown XS interface to it.

Unless you have to work with the output of another program you would do far better to use say Berkeley DB via perl.