API-MS-Win-Core-Profile-L1-1-0

All functions in the API-MS-Win-Core-Profile-L1-1-0 set are documented exports from KERNEL32 in version 3.51 and higher:

• QueryPerformanceCounter
• QueryPerformanceFrequency

The implementations in KERNEL32 version 6.1 and higher are just stubs which transfer the handling to wherever the schema redirects the API Set.

New Locations

Both functions in this API Set are exported from KERNELBASE version 6.1 and higher as forwards to corresponding NTDLL functions.

Schema Redirection

The Windows 7 schema redirects this API Set to KERNELBASE. Thus:

• high-level executables, which do not use the API Set, continue to import these functions from KERNEL32;
• low-level executables have their imports from the API Set redirected to KERNELBASE;
• as a particular case of the preceding, the stub implementations in KERNEL32 import from underlying implementations in KERNELBASE.