The name gives it away: api-ms-win-core-windowserrorreporting-l1-1-1.dll belongs to the (WER) subsystem. Specifically, it’s part of Microsoft’s API Set Schema —a virtualization layer introduced to help Windows decouple system libraries from the core OS.
If the error occurs only when using a specific program:
Api-ms-win-core-windowserrorreporting-l1-1-1.dll Jun 2026
The name gives it away: api-ms-win-core-windowserrorreporting-l1-1-1.dll belongs to the (WER) subsystem. Specifically, it’s part of Microsoft’s API Set Schema —a virtualization layer introduced to help Windows decouple system libraries from the core OS.
If the error occurs only when using a specific program: Api-ms-win-core-windowserrorreporting-l1-1-1.dll