diff --git a/External/FEXCore/Source/Interface/Config/Config.cpp b/External/FEXCore/Source/Interface/Config/Config.cpp
index 37c7eac91..324ca219a 100644
--- a/External/FEXCore/Source/Interface/Config/Config.cpp
+++ b/External/FEXCore/Source/Interface/Config/Config.cpp
@@ -19,7 +19,6 @@
 #include <assert.h>
 #include <cstdlib>
 #include <functional>
-#include <linux/limits.h>
 #include <optional>
 #include <stddef.h>
 #include <stdint.h>
@@ -315,7 +314,7 @@ namespace JSON {
 
       // Expand relative path to absolute
       char ExistsTempPath[PATH_MAX];
-      char *RealPath = realpath(PathName.c_str(), ExistsTempPath);
+      char *RealPath = FHU::Filesystem::Absolute(PathName.c_str(), ExistsTempPath);
       if (RealPath) {
         PathName = RealPath;
       }
diff --git a/FEXHeaderUtils/FEXHeaderUtils/Filesystem.h b/FEXHeaderUtils/FEXHeaderUtils/Filesystem.h
index 757a7a4d2..2b0fcc570 100644
--- a/FEXHeaderUtils/FEXHeaderUtils/Filesystem.h
+++ b/FEXHeaderUtils/FEXHeaderUtils/Filesystem.h
@@ -8,7 +8,12 @@
 #include <fcntl.h>
 #include <memory_resource>
 #include <string>
+#ifndef _WIN32
+#include <linux/limits.h>
 #include <sys/sendfile.h>
+#else
+#include <filesystem>
+#endif
 #include <sys/stat.h>
 #include <unistd.h>
 
@@ -40,6 +45,7 @@ namespace FHU::Filesystem {
    *
    * @return Result enum depending.
    */
+#ifndef _WIN32
   inline CreateDirectoryResult CreateDirectory(const fextl::string &Path) {
     auto Result = ::mkdir(Path.c_str(), 0777);
     if (Result == 0) {
@@ -60,6 +66,19 @@ namespace FHU::Filesystem {
     // Couldn't create, or the path that existed wasn't a folder.
     return CreateDirectoryResult::ERROR;
   }
+#else
+  // TODO: Should be rewritten using WIN32 specific APIs.
+  inline CreateDirectoryResult CreateDirectory(const fextl::string &Path) {
+    std::error_code ec;
+    if (std::filesystem::exists(Path, ec)) {
+      return CreateDirectoryResult::EXISTS;
+    }
+
+    return std::filesystem::create_directory(Path, ec) ?
+      CreateDirectoryResult::CREATED :
+      CreateDirectoryResult::ERROR;
+  }
+#endif
 
   /**
    * @brief Creates a directory tree with the provided path.
@@ -152,6 +171,7 @@ namespace FHU::Filesystem {
    *
    * @return True if the copy succeeded, false otherwise.
    */
+#ifndef _WIN32
   inline bool CopyFile(const fextl::string &From, const fextl::string &To, CopyOptions Options = CopyOptions::NONE) {
     const bool DestExists = Exists(To);
     if (Options == CopyOptions::SKIP_EXISTING && DestExists) {
@@ -199,6 +219,22 @@ namespace FHU::Filesystem {
 
     return false;
   }
+#else
+  // TODO: Should be rewritten using WIN32 specific APIs.
+  inline bool CopyFile(const fextl::string &From, const fextl::string &To, CopyOptions Options = CopyOptions::NONE) {
+    std::filesystem::copy_options options{};
+    if (Options == CopyOptions::SKIP_EXISTING) {
+      options = std::filesystem::copy_options::skip_existing;
+    }
+    else if (Options == CopyOptions::OVERWRITE_EXISTING) {
+      options = std::filesystem::copy_options::overwrite_existing;
+    }
+
+    std::error_code ec;
+    return std::filesystem::copy_file(From, To, options, ec);
+  }
+
+#endif
 
   /**
    * @brief Renames a file and overwrites if it already exists.
@@ -311,4 +347,23 @@ namespace FHU::Filesystem {
       fmt::join(Parts, "/"),
       NeedsFinalSeparator ? "/" : "");
   }
+
+#ifndef _WIN32
+  inline char *Absolute(const char *Path, char Fill[PATH_MAX]) {
+    return realpath(Path, Fill);
+  }
+#else
+  // TODO: Should be rewritten using WIN32 specific APIs.
+  inline char *Absolute(const char *Path, char Fill[PATH_MAX]) {
+    std::error_code ec;
+    const auto PathAbsolute = std::filesystem::absolute(Path, ec);
+    if (!ec) {
+      strncpy(Fill, PathAbsolute.string().c_str(), sizeof(*Fill));
+      return Fill;
+    }
+
+    return nullptr;
+  }
+#endif
+
 }
diff --git a/FEXHeaderUtils/FEXHeaderUtils/Syscalls.h b/FEXHeaderUtils/FEXHeaderUtils/Syscalls.h
index d51e89be9..9d8dec6c3 100644
--- a/FEXHeaderUtils/FEXHeaderUtils/Syscalls.h
+++ b/FEXHeaderUtils/FEXHeaderUtils/Syscalls.h
@@ -1,9 +1,16 @@
 #pragma once
+
+#include <FEXCore/Utils/LogManager.h>
+
 #include <cstdint>
 #include <sched.h>
 #include <signal.h>
 #include <stdio.h>
+#ifndef _WIN32
 #include <syscall.h>
+#else
+#include <processthreadsapi.h>
+#endif
 #include <sys/stat.h>
 #include <unistd.h>
 
@@ -43,6 +50,7 @@ namespace FHU::Syscalls {
 #define SYS_pidfd_open 434
 #endif
 
+#ifndef _WIN32
 inline int32_t getcpu(uint32_t *cpu, uint32_t *node) {
   // Third argument is unused
 #if defined(HAS_SYSCALL_GETCPU) && HAS_SYSCALL_GETCPU
@@ -87,5 +95,23 @@ inline int32_t renameat2(int olddirfd, const char *oldpath, int newdirfd, const
 inline int32_t pidfd_open(pid_t pid, unsigned int flags) {
   return ::syscall(SYS_pidfd_open, pid, flags);
 }
+#else
+
+inline int32_t getcpu(uint32_t *cpu, uint32_t *node) {
+  *cpu = GetCurrentProcessorNumber();
+  *node = 0;
+  return 0;
+}
+
+inline int32_t tgkill(pid_t tgid, pid_t tid, int sig) {
+  ERROR_AND_DIE_FMT("Unsupported");
+  return 0;
+}
+
+inline int32_t gettid() {
+  return GetCurrentThreadId();
+}
+
+#endif
 
 }