Riven ZIPS resources
From A look inside The Link @ wiki
Found again only in saved games, this contains a list of visited locations to support the "Zip Mode". It starts with an unsigned short telling how many records will follow. Then, each record contains the following data:
unsigned short | name_len |
char | name[name_len] |
unsigned short | card_id |
As one can easily imagine, each record is linked to a card: card_id tells its ID, and name is equal to the CARD name. Zip Mode hotspots have the same name too, so when they are clicked, the target card ID can be known by looking up in the ZIPS. If the user already visited that card, the record will be there.