diff --git a/core/libs/prx/libSceAgcDriver/tests/Recorder.cpp b/core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
index fd907a1040..f2ab3c7593 100644
--- a/core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
+++ b/core/libs/prx/libSceAgcDriver/tests/Recorder.cpp
@@ -11087,7 +11087,7 @@ void pipelineCacheHeaderTests(const Device& device) {
     Require(versionDirectory.native().size() >= 220 && versionDirectory.native().size() <= 249, "the pipeline cache directory is not between 220 and 249 characters");
 #ifdef _WIN32
     _putenv_s("ANYPS5_NO_SHADER_CACHE", "0");
-    _putenv_s("ANYPS5_SHADER_CACHE_DIR", directory.string().c_str());
+    _wputenv_s(L"ANYPS5_SHADER_CACHE_DIR", directory.c_str());
 #else
     setenv("ANYPS5_NO_SHADER_CACHE", "0", 1);
     setenv("ANYPS5_SHADER_CACHE_DIR", directory.string().c_str(), 1);
diff --git a/core/libs/prx/libSceAgcDriver/tests/execution/LazyResolvedAbi.cpp b/core/libs/prx/libSceAgcDriver/tests/execution/LazyResolvedAbi.cpp
index aad7c87ddb..923ff59054 100644
--- a/core/libs/prx/libSceAgcDriver/tests/execution/LazyResolvedAbi.cpp
+++ b/core/libs/prx/libSceAgcDriver/tests/execution/LazyResolvedAbi.cpp
@@ -602,7 +602,11 @@ int main(int argc, char** argv) {
             std::filesystem::create_directories(cache);
             SetEnvironment("LAZY_RESOLVED_ABI_REFERENCE", reference.string());
             SetEnvironment("ANYPS5_NO_SHADER_CACHE", "0");
+#ifdef _WIN32
+            _wputenv_s(L"ANYPS5_SHADER_CACHE_DIR", cache.c_str());
+#else
             SetEnvironment("ANYPS5_SHADER_CACHE_DIR", cache.string());
+#endif
             SetEnvironment("APS5_NO_PIPELINE_JOURNAL", "1");
             ClearEnvironment("APS5_LAZY_SHADER_PREPARE");
             const std::string command = "\"" + std::string(argv[0]) + "\" --eager-reference";
diff --git a/core/libs/tests/GuestAudio3dPort.cpp b/core/libs/tests/GuestAudio3dPort.cpp
index 5dea9e7bdd..0cc56ad6fd 100644
--- a/core/libs/tests/GuestAudio3dPort.cpp
+++ b/core/libs/tests/GuestAudio3dPort.cpp
@@ -16,6 +16,15 @@
 #include <string_view>
 #include <thread>
 #include <vector>
+#ifdef _WIN32
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#endif
 
 namespace {
 
@@ -655,11 +664,15 @@ int RunAsPs4Process(const char* program) {
         file << std::string("TITLE\0TITLE_ID\0\0\0\0\0\0", 20) << std::string("Example\0", 8) << "CUSA00000" << std::string("\0\0\0", 3);
     }
 #ifdef _WIN32
-    const std::string command = "\"cd /d \"" + directory.string() + "\" && \"" + program + "\" ps4-process\"";
+    static_cast<void>(program);
+    std::wstring executable(32768, L'\0');
+    executable.resize(GetModuleFileNameW(nullptr, executable.data(), static_cast<DWORD>(executable.size())));
+    const std::wstring command = L"\"cd /d \"" + directory.wstring() + L"\" && \"" + executable + L"\" ps4-process\"";
+    const int status = _wsystem(command.c_str());
 #else
     const std::string command = "cd \"" + directory.string() + "\" && \"" + program + "\" ps4-process";
-#endif
     const int status = std::system(command.c_str());
+#endif
     std::filesystem::remove_all(directory);
     return status;
 }
diff --git a/core/libs/tests/GuestKernelSysConsoleIdentity.cpp b/core/libs/tests/GuestKernelSysConsoleIdentity.cpp
index dc953c7fbb..3dacd9e8b6 100644
--- a/core/libs/tests/GuestKernelSysConsoleIdentity.cpp
+++ b/core/libs/tests/GuestKernelSysConsoleIdentity.cpp
@@ -11,6 +11,15 @@
 #include <random>
 #include <string>
 #include <string_view>
+#ifdef _WIN32
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#endif
 
 namespace {
 
@@ -103,11 +112,14 @@ int main(int argc, char** argv) {
         file << std::string("TITLE\0TITLE_ID\0\0\0\0\0\0", 20) << std::string("Example\0", 8) << "CUSA00000" << std::string("\0\0\0", 3);
     }
 #ifdef _WIN32
-    const std::string command = "\"cd /d \"" + directory.string() + "\" && \"" + argv[0] + "\" ps4-child\"";
+    std::wstring executable(32768, L'\0');
+    executable.resize(GetModuleFileNameW(nullptr, executable.data(), static_cast<DWORD>(executable.size())));
+    const std::wstring command = L"\"cd /d \"" + directory.wstring() + L"\" && \"" + executable + L"\" ps4-child\"";
+    const int status = _wsystem(command.c_str());
 #else
     const std::string command = "cd \"" + directory.string() + "\" && \"" + argv[0] + "\" ps4-child";
-#endif
     const int status = std::system(command.c_str());
+#endif
     std::filesystem::remove_all(directory);
     Require(status == 0, "the PS4 child process must succeed");
     return 0;
diff --git a/core/libs/tests/GuestSyslog.cpp b/core/libs/tests/GuestSyslog.cpp
index c0a954c07a..8d541a4401 100644
--- a/core/libs/tests/GuestSyslog.cpp
+++ b/core/libs/tests/GuestSyslog.cpp
@@ -1,5 +1,6 @@
 #include "prx/libc/include/Api.hpp"
 #include "prx/libc/include/general/VabiMacros.hpp"
+#include "tests/TemporaryFile.hpp"
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
@@ -14,7 +15,7 @@
 
 static void Require(bool value) { if (!value) std::abort(); }
 int main() {
-    auto* captured = std::tmpfile();
+    auto* captured = TemporaryFile::Open();
     Require(captured != nullptr);
     std::fflush(stderr);
 #ifdef _WIN32