It stops the game from checking the Taleworlds servers for a valid license.

Try running the game in compatibility mode. Right-click on the game's executable, go to Properties, and then under the Compatibility tab, try different Windows versions to see if one works.

Skidrow, a well-known cracking group, released a crack fix for the 1153 version of Mount and Blade: Warband. The crack fix aimed to address the issues encountered by players, including game crashes, freezes, and compatibility problems. The fix also enabled players to play the game without encountering the usual cracking issues.