diff --git a/src/xenia/app/premake5.lua b/src/xenia/app/premake5.lua
index 442d6585b..d20fe565a 100644
--- a/src/xenia/app/premake5.lua
+++ b/src/xenia/app/premake5.lua
@@ -50,18 +50,20 @@ project("xenia-app")
   files({
     "xenia_main.cc",
     "../base/main_"..platform_suffix..".cc",
+    "../base/main_entrypoint_"..platform_suffix..".cc",
   })
 
-  filter("files:xenia_main.cc or ../base/main_"..platform_suffix..".cc")
-    vectorextensions("IA32")  -- Disable AVX for main_win.cc so our AVX check/error can happen.
+  resincludedirs({
+    project_root,
+  })
 
   filter("platforms:Windows")
     files({
       "main_resources.rc",
     })
-  resincludedirs({
-    project_root,
-  })
+
+  filter("files:../base/main_entrypoint_"..platform_suffix..".cc")
+    vectorextensions("IA32")  -- Disable AVX so our AVX check/error can happen.
 
   filter("platforms:Linux")
     links({
diff --git a/src/xenia/base/main_entrypoint_posix.cc b/src/xenia/base/main_entrypoint_posix.cc
new file mode 100644
index 000000000..b93b31502
--- /dev/null
+++ b/src/xenia/base/main_entrypoint_posix.cc
@@ -0,0 +1,38 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2014 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/base/main.h"
+
+#include <gflags/gflags.h>
+
+#include "xenia/base/logging.h"
+#include "xenia/base/string.h"
+
+extern "C" int main(int argc, char** argv) {
+  auto entry_info = xe::GetEntryInfo();
+
+  google::SetUsageMessage(std::string("usage: ") +
+                          xe::to_string(entry_info.usage));
+  google::SetVersionString("1.0");
+  google::ParseCommandLineFlags(&argc, &argv, true);
+
+  std::vector<std::wstring> args;
+  for (int n = 0; n < argc; n++) {
+    args.push_back(xe::to_wstring(argv[n]));
+  }
+
+  // Initialize logging. Needs parsed FLAGS.
+  xe::InitializeLogging(entry_info.name);
+
+  // Call app-provided entry point.
+  int result = entry_info.entry_point(args);
+
+  google::ShutDownCommandLineFlags();
+  return result;
+}
diff --git a/src/xenia/base/main_entrypoint_win.cc b/src/xenia/base/main_entrypoint_win.cc
new file mode 100644
index 000000000..9ec762d74
--- /dev/null
+++ b/src/xenia/base/main_entrypoint_win.cc
@@ -0,0 +1,79 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2014 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/base/main.h"
+
+#include <fcntl.h>
+#include <gflags/gflags.h>
+#include <io.h>
+
+#include <cstdlib>
+
+// Autogenerated by `xb premake`.
+#include "build/version.h"
+
+#include "xenia/base/platform_win.h"
+#include "xenia/base/string.h"
+
+#include "third_party/xbyak/xbyak/xbyak_util.h"
+
+namespace xe {
+void AttachConsole();
+int Main();
+};  // namespace xe
+
+// Used in console mode apps; automatically picked based on subsystem.
+int main(int, char**) {
+  Xbyak::util::Cpu cpu;
+  if (!cpu.has(Xbyak::util::Cpu::tAVX)) {
+    printf(
+        "Your CPU does not support AVX, which is required by Xenia.\r\nSee the "
+        "FAQ for system requirements at https://xenia.jp\r\n");
+    return -1;
+  }
+  return xe::Main();
+}
+
+// Used in windowed apps; automatically picked based on subsystem.
+int WINAPI wWinMain(HINSTANCE, HINSTANCE, LPWSTR, int) {
+  Xbyak::util::Cpu cpu;
+  if (!cpu.has(Xbyak::util::Cpu::tAVX)) {
+    MessageBoxA(
+        NULL,
+        "Your CPU does not support AVX, which is required by Xenia. See the "
+        "FAQ for system requirements at https://xenia.jp",
+        "Xenia Error", MB_OK | MB_ICONERROR | MB_APPLMODAL | MB_SETFOREGROUND);
+    return -1;
+  }
+
+  // Attach a console so we can write output to stdout. If the user hasn't
+  // redirected output themselves it'll pop up a window.
+  xe::AttachConsole();
+
+  // Run normal entry point.
+  return xe::Main();
+}
+
+#if defined _M_IX86
+#pragma comment( \
+    linker,      \
+    "/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='x86' publicKeyToken='6595b64144ccf1df' language='*'\"")  // NOLINT(whitespace/line_length)
+#elif defined _M_IA64
+#pragma comment( \
+    linker,      \
+    "/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='ia64' publicKeyToken='6595b64144ccf1df' language='*'\"")  // NOLINT(whitespace/line_length)
+#elif defined _M_X64
+#pragma comment( \
+    linker,      \
+    "/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='amd64' publicKeyToken='6595b64144ccf1df' language='*'\"")  // NOLINT(whitespace/line_length)
+#else
+#pragma comment( \
+    linker,      \
+    "/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")  // NOLINT(whitespace/line_length)
+#endif
diff --git a/src/xenia/base/main_posix.cc b/src/xenia/base/main_posix.cc
index 55dfae745..0a7d75521 100644
--- a/src/xenia/base/main_posix.cc
+++ b/src/xenia/base/main_posix.cc
@@ -19,26 +19,3 @@ namespace xe {
 bool has_console_attached() { return true; }
 
 }  // namespace xe
-
-extern "C" int main(int argc, char** argv) {
-  auto entry_info = xe::GetEntryInfo();
-
-  google::SetUsageMessage(std::string("usage: ") +
-                          xe::to_string(entry_info.usage));
-  google::SetVersionString("1.0");
-  google::ParseCommandLineFlags(&argc, &argv, true);
-
-  std::vector<std::wstring> args;
-  for (int n = 0; n < argc; n++) {
-    args.push_back(xe::to_wstring(argv[n]));
-  }
-
-  // Initialize logging. Needs parsed FLAGS.
-  xe::InitializeLogging(entry_info.name);
-
-  // Call app-provided entry point.
-  int result = entry_info.entry_point(args);
-
-  google::ShutDownCommandLineFlags();
-  return result;
-}
diff --git a/src/xenia/base/main_win.cc b/src/xenia/base/main_win.cc
index e495b07d8..c0c818bcc 100644
--- a/src/xenia/base/main_win.cc
+++ b/src/xenia/base/main_win.cc
@@ -129,14 +129,6 @@ int Main() {
   // Initialize logging. Needs parsed FLAGS.
   xe::InitializeLogging(entry_info.name);
 
-  Xbyak::util::Cpu cpu;
-  if (!cpu.has(Xbyak::util::Cpu::tAVX)) {
-    xe::FatalError(
-        "Your CPU does not support AVX, which is required by Xenia. See the "
-        "FAQ for system requirements at https://xenia.jp");
-    return -1;
-  }
-
   // Print version info.
   XELOGI("Build: %s / %s on %s", XE_BUILD_BRANCH, XE_BUILD_COMMIT,
          XE_BUILD_DATE);
@@ -156,34 +148,3 @@ int Main() {
 }
 
 }  // namespace xe
-
-// Used in console mode apps; automatically picked based on subsystem.
-int main(int argc_ignored, char** argv_ignored) { return xe::Main(); }
-
-// Used in windowed apps; automatically picked based on subsystem.
-int WINAPI wWinMain(HINSTANCE, HINSTANCE, LPWSTR command_line, int) {
-  // Attach a console so we can write output to stdout. If the user hasn't
-  // redirected output themselves it'll pop up a window.
-  xe::AttachConsole();
-
-  // Run normal entry point.
-  return xe::Main();
-}
-
-#if defined _M_IX86
-#pragma comment( \
-    linker,      \
-    "/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='x86' publicKeyToken='6595b64144ccf1df' language='*'\"")  // NOLINT(whitespace/line_length)
-#elif defined _M_IA64
-#pragma comment( \
-    linker,      \
-    "/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='ia64' publicKeyToken='6595b64144ccf1df' language='*'\"")  // NOLINT(whitespace/line_length)
-#elif defined _M_X64
-#pragma comment( \
-    linker,      \
-    "/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='amd64' publicKeyToken='6595b64144ccf1df' language='*'\"")  // NOLINT(whitespace/line_length)
-#else
-#pragma comment( \
-    linker,      \
-    "/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")  // NOLINT(whitespace/line_length)
-#endif
diff --git a/src/xenia/cpu/ppc/testing/premake5.lua b/src/xenia/cpu/ppc/testing/premake5.lua
index d2d5549cd..11dcbe961 100644
--- a/src/xenia/cpu/ppc/testing/premake5.lua
+++ b/src/xenia/cpu/ppc/testing/premake5.lua
@@ -18,6 +18,7 @@ project("xenia-cpu-ppc-tests")
   files({
     "ppc_testing_main.cc",
     "../../../base/main_"..platform_suffix..".cc",
+    "../../../base/main_entrypoint_"..platform_suffix..".cc",
   })
   files({
     "*.s",
@@ -25,8 +26,11 @@ project("xenia-cpu-ppc-tests")
   includedirs({
     project_root.."/third_party/gflags/src",
   })
+
   filter("files:*.s")
     flags({"ExcludeFromBuild"})
+  filter("files:../../../base/main_entrypoint_"..platform_suffix..".cc")
+    vectorextensions("IA32")  -- Disable AVX so our AVX check/error can happen.
   filter("platforms:Windows")
     debugdir(project_root)
     debugargs({
@@ -51,14 +55,12 @@ project("xenia-cpu-ppc-nativetests")
   files({
     "ppc_testing_native_main.cc",
     "../../../base/main_"..platform_suffix..".cc",
+    "../../../base/main_entrypoint_"..platform_suffix..".cc",
   })
   files({
     "instr_*.s",
     "seq_*.s",
   })
-  filter("files:instr_*.s", "files:seq_*.s")
-    flags({"ExcludeFromBuild"})
-  filter({})
   includedirs({
     project_root.."/third_party/gflags/src",
   })
@@ -70,4 +72,9 @@ project("xenia-cpu-ppc-nativetests")
     "ppc_testing_native_thunks.s",
   })
 
+  filter("files:instr_*.s", "files:seq_*.s")
+    flags({"ExcludeFromBuild"})
+  filter("files:../../../base/main_entrypoint_"..platform_suffix..".cc")
+    vectorextensions("IA32")  -- Disable AVX so our AVX check/error can happen.
+
 end
\ No newline at end of file
diff --git a/src/xenia/gpu/premake5.lua b/src/xenia/gpu/premake5.lua
index d0ce85820..fdc2c4e6f 100644
--- a/src/xenia/gpu/premake5.lua
+++ b/src/xenia/gpu/premake5.lua
@@ -46,8 +46,12 @@ project("xenia-gpu-shader-compiler")
   files({
     "shader_compiler_main.cc",
     "../base/main_"..platform_suffix..".cc",
+    "../base/main_entrypoint_"..platform_suffix..".cc",
   })
 
+  filter("files:../base/main_entrypoint_"..platform_suffix..".cc")
+    vectorextensions("IA32")  -- Disable AVX so our AVX check/error can happen.
+
   filter("platforms:Windows")
     -- Only create the .user file if it doesn't already exist.
     local user_file = project_root.."/build/xenia-gpu-shader-compiler.vcxproj.user"
diff --git a/src/xenia/gpu/vulkan/premake5.lua b/src/xenia/gpu/vulkan/premake5.lua
index 82b843b59..4d2b70990 100644
--- a/src/xenia/gpu/vulkan/premake5.lua
+++ b/src/xenia/gpu/vulkan/premake5.lua
@@ -68,8 +68,12 @@ project("xenia-gpu-vulkan-trace-viewer")
   files({
     "vulkan_trace_viewer_main.cc",
     "../../base/main_"..platform_suffix..".cc",
+    "../../base/main_entrypoint_"..platform_suffix..".cc",
   })
 
+  filter("files:../../base/main_entrypoint_"..platform_suffix..".cc")
+    vectorextensions("IA32")  -- Disable AVX so our AVX check/error can happen.
+
   filter("platforms:Linux")
     links({
       "X11",
@@ -139,8 +143,12 @@ project("xenia-gpu-vulkan-trace-dump")
   files({
     "vulkan_trace_dump_main.cc",
     "../../base/main_"..platform_suffix..".cc",
+    "../../base/main_entrypoint_"..platform_suffix..".cc",
   })
 
+  filter("files:../../base/main_entrypoint_"..platform_suffix..".cc")
+    vectorextensions("IA32")  -- Disable AVX so our AVX check/error can happen.
+
   filter("platforms:Linux")
     links({
       "X11",
diff --git a/src/xenia/hid/premake5.lua b/src/xenia/hid/premake5.lua
index ea7b6afbf..67580189f 100644
--- a/src/xenia/hid/premake5.lua
+++ b/src/xenia/hid/premake5.lua
@@ -43,11 +43,15 @@ project("xenia-hid-demo")
   files({
     "hid_demo.cc",
     "../base/main_"..platform_suffix..".cc",
+    "../base/main_entrypoint_"..platform_suffix..".cc",
   })
   resincludedirs({
     project_root,
   })
 
+  filter("files:../base/main_entrypoint_"..platform_suffix..".cc")
+    vectorextensions("IA32")  -- Disable AVX so our AVX check/error can happen.
+
   filter("platforms:Linux")
     links({
       "X11",
diff --git a/src/xenia/ui/vulkan/premake5.lua b/src/xenia/ui/vulkan/premake5.lua
index 8246ef249..74ea9e6db 100644
--- a/src/xenia/ui/vulkan/premake5.lua
+++ b/src/xenia/ui/vulkan/premake5.lua
@@ -47,11 +47,15 @@ project("xenia-ui-window-vulkan-demo")
     "../window_demo.cc",
     "vulkan_window_demo.cc",
     project_root.."/src/xenia/base/main_"..platform_suffix..".cc",
+    project_root.."/src/xenia/base/main_entrypoint_"..platform_suffix..".cc",
   })
   resincludedirs({
     project_root,
   })
 
+  filter("files:"..project_root.."/src/xenia/base/main_entrypoint_"..platform_suffix..".cc")
+    vectorextensions("IA32")  -- Disable AVX so our AVX check/error can happen.
+
   filter("platforms:Linux")
     links({
       "X11",
diff --git a/src/xenia/vfs/premake5.lua b/src/xenia/vfs/premake5.lua
index ea174e3e0..cdb0a66f1 100644
--- a/src/xenia/vfs/premake5.lua
+++ b/src/xenia/vfs/premake5.lua
@@ -34,8 +34,11 @@ project("xenia-vfs-dump")
   files({
     "vfs_dump.cc",
     project_root.."/src/xenia/base/main_"..platform_suffix..".cc",
+    project_root.."/src/xenia/base/main_entrypoint_"..platform_suffix..".cc",
   })
   resincludedirs({
     project_root,
   })
 
+  filter("files:"..project_root.."/src/xenia/base/main_entrypoint_"..platform_suffix..".cc")
+    vectorextensions("IA32")  -- Disable AVX so our AVX check/error can happen.