Always obtain system files through official or Microsoft Redistributable installers. To help you better, could you tell me: What program or game are you trying to open? Which version of Windows are you currently using?
In simpler terms: this is a core system file that allows modern software (especially those built with Visual Studio 2015, 2017, 2019, and 2021 update cycles) to interact with Windows’ memory without crashing.
Once you've downloaded the APIMSWINCOREMEMORYL116DLL file, follow these steps to install and register it: