diff --git a/build_rts.py b/build_rts.py
index efcff30c..05c37eb2 100755
--- a/build_rts.py
+++ b/build_rts.py
@@ -84,7 +84,8 @@
 from x86_64 import X8664Generic
 
 # native
-from native import Aarch64Native, X86Native, X8664Native
+from linux import Aarch64Linux, X86Linux, X8664Linux
+from windows import X86Windows, X8664Windows
 
 # vx7r2cert
 from vx7r2cert import (
@@ -282,12 +283,16 @@ def build_configs(target):
     elif target == "x86_64":
         t = X8664Generic()
     # native platforms
-    elif target in ("x86-linux", "x86-windows"):
-        t = X86Native(target)
-    elif target in ("x86_64-linux", "x86_64-windows", "x86_64-windows64"):
-        t = X8664Native(target)
-    elif target in ("aarch64-linux",):
-        t = Aarch64Native(target)
+    elif target == "aarch64-linux":
+        t = Aarch64Linux()
+    elif target == "x86-linux":
+        t = X86Linux()
+    elif target == "x86_64-linux":
+        t = X8664Linux()
+    elif target == "x86-windows":
+        t = X86Windows()
+    elif target in ("x86_64-windows", "x86_64-windows64"):
+        t = X8664Windows()
     # vx7r2cert
     elif target == "aarch64-vx7r2cert":
         t = AArch64Vx7r2Cert()
diff --git a/native/__init__.py b/linux/__init__.py
similarity index 60%
rename from native/__init__.py
rename to linux/__init__.py
index 28ba6e2c..9f7bb6d3 100644
--- a/native/__init__.py
+++ b/linux/__init__.py
@@ -1,23 +1,18 @@
 from support.bsp_sources.target import DFBBTarget
 
 
-class Native(DFBBTarget):
-    def __init__(self, target):
+class Linux(DFBBTarget):
+    def __init__(self):
         super().__init__()
         self.add_gnat_sources("src/s-macres__native.adb")
-        # Use the bb source of s-textio for Windows as a custom
-        # source profile is not yet supported.
-        # eng/toolchain/bb-runtimes#78
-        if "windows" in target:
-            self.add_gnat_sources("src/s-textio__stdio.adb")
-
-    @property
-    def target(self):
-        return None
 
     def has_libc(self, profile):
         return True
 
+    @property
+    def name(self):
+        return self.target
+
     def dump_runtime_xml(self, rts_name, rts):
         return (
             '<?xml version="1.0" ?>\n'
@@ -27,24 +22,25 @@ def dump_runtime_xml(self, rts_name, rts):
             "</gprconfig>\n"
         )
 
-    def amend_rts(self, rts_profile, cfg):
-        super().amend_rts(rts_profile, cfg)
+    @property
+    def is_legacy_format(self):
+        return True
 
 
-class X86Native(Native):
+class X86Linux(Linux):
     @property
-    def name(self):
-        return "native-x86"
+    def target(self):
+        return "x86-linux"
 
     @property
     def system_ads(self):
         return {"light": "system-native-x86-light.ads"}
 
 
-class X8664Native(Native):
+class X8664Linux(Linux):
     @property
-    def name(self):
-        return "native-x86_64"
+    def target(self):
+        return "x86_64-linux"
 
     @property
     def is_64bit(self):
@@ -55,10 +51,10 @@ def system_ads(self):
         return {"light": "system-native-x86-light.ads"}
 
 
-class Aarch64Native(Native):
+class Aarch64Linux(Linux):
     @property
-    def name(self):
-        return "native-aarch64"
+    def target(self):
+        return "aarch64-linux"
 
     @property
     def is_64bit(self):
diff --git a/windows/__init__.py b/windows/__init__.py
new file mode 100644
index 00000000..4e7ce7a1
--- /dev/null
+++ b/windows/__init__.py
@@ -0,0 +1,51 @@
+from support.bsp_sources.target import DFBBTarget
+
+
+class Windows(DFBBTarget):
+    def __init__(self):
+        super().__init__()
+        self.add_gnat_sources("src/s-macres__native.adb", "src/s-textio__stdio.adb")
+
+    @property
+    def name(self):
+        return self.target
+
+    def has_libc(self, profile):
+        return True
+
+    def dump_runtime_xml(self, rts_name, rts):
+        return (
+            '<?xml version="1.0" ?>\n'
+            "<gprconfig>\n"
+            "  <configuration>\n"
+            "  </configuration>\n"
+            "</gprconfig>\n"
+        )
+
+    @property
+    def is_legacy_format(self):
+        return True
+
+
+class X86Windows(Windows):
+    @property
+    def target(self):
+        return "x86-windows"
+
+    @property
+    def system_ads(self):
+        return {"light": "system-native-x86-light.ads"}
+
+
+class X8664Windows(Windows):
+    @property
+    def target(self):
+        return "x86_64-windows"
+
+    @property
+    def is_64bit(self):
+        return True
+
+    @property
+    def system_ads(self):
+        return {"light": "system-native-x86-light.ads"}