diff --git a/sdk/include/vcruntime/isa_availability.h b/sdk/include/vcruntime/isa_availability.h
new file mode 100644
index 00000000000..4b011fca3e2
--- /dev/null
+++ b/sdk/include/vcruntime/isa_availability.h
@@ -0,0 +1,33 @@
+/*
+ * PROJECT:     ReactOS SDK
+ * LICENSE:     MIT (https://spdx.org/licenses/MIT)
+ * PURPOSE:     CRT - ISA availability
+ * COPYRIGHT:   Copyright 2024 Timo Kreuzer (timo.kreuzer@reactos.org)
+ */
+
+#pragma once
+
+#define __ISA_AVAILABILITY__H__
+
+enum ISA_AVAILABILITY
+{
+    __ISA_AVAILABLE_X86   = 0,
+    __ISA_AVAILABLE_SSE2  = 1,
+    __ISA_AVAILABLE_SSE42 = 2,
+    __ISA_AVAILABLE_AVX   = 3,
+    __ISA_AVAILABLE_ENFSTRG = 4,
+    __ISA_AVAILABLE_AVX2 = 5,
+    __ISA_AVAILABLE_AVX512 = 6,
+
+    __ISA_AVAILABLE_ARMNT   = 0,
+    __ISA_AVAILABLE_NEON    = 1,
+    __ISA_AVAILABLE_NEON_ARM64 = 2,
+};
+
+#if defined(_M_IX86)
+#define __FAVOR_ATOM    0
+#define __FAVOR_ENFSTRG 1
+#elif defined(_M_X64)
+#define __FAVOR_ATOM    0
+#define __FAVOR_ENFSTRG 1
+#endif