diff --git a/platforms/arm64-linux.xml b/platforms/arm64-linux.xml
new file mode 100644
index 00000000000..d8b6a4e7cf6
--- /dev/null
+++ b/platforms/arm64-linux.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0"?>
+<!-- 64-bit ARM Linux (AArch64 LP64 ABI). This describes the default setup. This platform file may also be suitable for bare-metal and RTOS targets (e.g. Zephyr, FreeRTOS) that use the AArch64 LP64 ABI. -->
+<platform>
+  <char_bit>8</char_bit>
+  <default-sign>unsigned</default-sign>
+  <sizeof>
+    <bool>1</bool>
+    <short>2</short>
+    <int>4</int>
+    <long>8</long>
+    <long-long>8</long-long>
+    <float>4</float>
+    <double>8</double>
+    <long-double>16</long-double>
+    <pointer>8</pointer>
+    <size_t>8</size_t>
+    <wchar_t>4</wchar_t>
+  </sizeof>
+</platform>
diff --git a/platforms/arm64-macos.xml b/platforms/arm64-macos.xml
new file mode 100644
index 00000000000..b5713159d2d
--- /dev/null
+++ b/platforms/arm64-macos.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0"?>
+<!-- 64-bit ARM macOS / Apple Silicon (Apple arm64 LP64 ABI). This describes the default setup. -->
+<platform>
+  <char_bit>8</char_bit>
+  <default-sign>signed</default-sign>
+  <sizeof>
+    <bool>1</bool>
+    <short>2</short>
+    <int>4</int>
+    <long>8</long>
+    <long-long>8</long-long>
+    <float>4</float>
+    <double>8</double>
+    <long-double>8</long-double>
+    <pointer>8</pointer>
+    <size_t>8</size_t>
+    <wchar_t>4</wchar_t>
+  </sizeof>
+</platform>
diff --git a/platforms/arm64-wchar_t2.xml b/platforms/arm64-wchar_t2.xml
index 2b0cff4989f..32d17d926d2 100644
--- a/platforms/arm64-wchar_t2.xml
+++ b/platforms/arm64-wchar_t2.xml
@@ -12,7 +12,7 @@
     <double>8</double>
     <long-double>8</long-double>
     <pointer>8</pointer>
-    <size_t>4</size_t>
+    <size_t>8</size_t>
     <wchar_t>2</wchar_t>
   </sizeof>
 </platform>
diff --git a/platforms/arm64-wchar_t4.xml b/platforms/arm64-wchar_t4.xml
index 35183bb089c..6842ff977df 100644
--- a/platforms/arm64-wchar_t4.xml
+++ b/platforms/arm64-wchar_t4.xml
@@ -12,7 +12,7 @@
     <double>8</double>
     <long-double>8</long-double>
     <pointer>8</pointer>
-    <size_t>4</size_t>
+    <size_t>8</size_t>
     <wchar_t>4</wchar_t>
   </sizeof>
 </platform>
diff --git a/platforms/arm64-windows.xml b/platforms/arm64-windows.xml
new file mode 100644
index 00000000000..f1ea3f39daf
--- /dev/null
+++ b/platforms/arm64-windows.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0"?>
+<!-- 64-bit ARM Windows (LLP64 ABI). This describes the default MSVC setup. LLP64 only defines the sizes of int, long, long long and pointers; other properties such as the signedness of char, the size of long double and the size of wchar_t are Windows specific, so a generic arm64 LLP64 platform file would not necessarily be identical to this one. -->
+<platform>
+  <char_bit>8</char_bit>
+  <default-sign>signed</default-sign>
+  <sizeof>
+    <bool>1</bool>
+    <short>2</short>
+    <int>4</int>
+    <long>4</long>
+    <long-long>8</long-long>
+    <float>4</float>
+    <double>8</double>
+    <long-double>8</long-double>
+    <pointer>8</pointer>
+    <size_t>8</size_t>
+    <wchar_t>2</wchar_t>
+  </sizeof>
+</platform>
diff --git a/releasenotes.txt b/releasenotes.txt
index 68b03d2b083..33fd4106800 100644
--- a/releasenotes.txt
+++ b/releasenotes.txt
@@ -20,7 +20,8 @@ Import project:
 -
 
 Infrastructure & dependencies:
--
+- Added arm64 platform files arm64-windows.xml, arm64-linux.xml and arm64-macos.xml (Apple Silicon).
+  These describe the default setup for that OS. The arm64-wchar_t2.xml and arm64-wchar_t4.xml files are kept.
 
 Other:
 -
diff --git a/win_installer/cppcheck.wxs b/win_installer/cppcheck.wxs
index 91d08c1c946..fe59fd6ea06 100644
--- a/win_installer/cppcheck.wxs
+++ b/win_installer/cppcheck.wxs
@@ -140,6 +140,9 @@
               <File Id='aix_ppc64.xml' Name='aix_ppc64.xml' Source='$(var.PtfsDir)\aix_ppc64.xml' />
               <File Id='arm32wchar_t2.xml' Name='arm32-wchar_t2.xml' Source='$(var.PtfsDir)\arm32-wchar_t2.xml' />
               <File Id='arm32wchar_t4.xml' Name='arm32-wchar_t4.xml' Source='$(var.PtfsDir)\arm32-wchar_t4.xml' />
+              <File Id='arm64linux.xml' Name='arm64-linux.xml' Source='$(var.PtfsDir)\arm64-linux.xml' />
+              <File Id='arm64macos.xml' Name='arm64-macos.xml' Source='$(var.PtfsDir)\arm64-macos.xml' />
+              <File Id='arm64windows.xml' Name='arm64-windows.xml' Source='$(var.PtfsDir)\arm64-windows.xml' />
               <File Id='arm64wchar_t2.xml' Name='arm64-wchar_t2.xml' Source='$(var.PtfsDir)\arm64-wchar_t2.xml' />
               <File Id='arm64wchar_t4.xml' Name='arm64-wchar_t4.xml' Source='$(var.PtfsDir)\arm64-wchar_t4.xml' />
               <File Id='avr8.xml' Name='avr8.xml' Source='$(var.PtfsDir)\avr8.xml' />