On Windows, there is no built-in system-level solution to directly limit the RAM usage of a specific program. Microsoft does not provide a feature like the M90 limit in Linux's /etc/limits to set a maximum memory allocation for a process. Third-party software might offer some control, but these solutions are not endorsed by Microsoft.

For users seeking to limit RAM usage for a program like a game or a resource-intensive application, here are some general approaches:

  1. Close unnecessary background programs: Reduce the number of active programs and services that consume system resources, allowing more RAM to be available for the targeted application.
  2. Adjust game settings: Lowering graphics and performance settings in games can reduce their RAM requirements.
  3. Use third-party software: Tools like Bitsum Process Lasso Pro or Cacheman 10 by Outertech (mentioned in the Reddit thread) may help regulate processes, but they cannot precisely limit RAM usage without potentially causing instability.
  4. Create a batch file: You can create a batch file with commands like taskkill and net stop to stop irrelevant processes and services before running the targeted application, freeing up RAM.

Please note that limiting RAM usage can lead to performance issues or even crashes if the program requires more memory than the imposed limit. It's often better to increase the available RAM or optimize the program's memory management.