The dates correspond to a calendar seen within the game. March 11th is specifically noted in Petscop 11 as a day when a character (care) "returned," while June 18th is linked to the "Room 1" events and the concept of "rebirthing."
In the Petscope narrative, this specific .rar file is presented as a backup or "save data" archive containing the state of the fictional game, Petscop . The numbers in the filename refer to two pivotal dates within the series' timeline: March 11, 2004.
While the file was never actually released for public download by the creator (Tony Fox), it serves as a storytelling device to show that the "game" is actually a collection of recorded inputs and "spirits" rather than just a standard software program. The "Petscop" Phenomenon
The series is presented as a "Let's Play" of an unreleased PS1 game.
The file represents a bridge between different "generations" of the game’s development and the tragic events surrounding the characters:
June 18 (likely 1997 or 2000, depending on the specific lore interpretation). Significance in Lore