diff --git a/src/frontend/qt_sdl/EmuInstance.cpp b/src/frontend/qt_sdl/EmuInstance.cpp
index 0d201a7c..0aa438ff 100644
--- a/src/frontend/qt_sdl/EmuInstance.cpp
+++ b/src/frontend/qt_sdl/EmuInstance.cpp
@@ -99,7 +99,7 @@ EmuInstance::~EmuInstance()
 {
     // TODO window cleanup and shit?
 
-    emuThread->emuStop();
+    emuThread->emuExit();
     emuThread->wait();
     delete emuThread;
 
@@ -165,6 +165,33 @@ void EmuInstance::osdAddMessage(unsigned int color, const char* fmt, ...)
 }
 
 
+bool EmuInstance::emuIsActive()
+{
+    return emuThread->emuIsActive();
+}
+
+void EmuInstance::emuStop(StopReason reason)
+{
+    emuThread->emuStop();
+
+    switch (reason)
+    {
+        case StopReason::GBAModeNotSupported:
+            Log(LogLevel::Error, "!! GBA MODE NOT SUPPORTED\n");
+            osdAddMessage(0xFFA0A0, "GBA mode not supported");
+            break;
+        case StopReason::BadExceptionRegion:
+            osdAddMessage(0xFFA0A0, "Internal error");
+            break;
+        case StopReason::PowerOff:
+        case StopReason::External:
+            osdAddMessage(0xFFC040, "Shutdown");
+        default:
+            break;
+    }
+}
+
+
 bool EmuInstance::usesOpenGL()
 {
     return globalCfg.GetBool("Screen.UseGL") ||
diff --git a/src/frontend/qt_sdl/EmuInstance.h b/src/frontend/qt_sdl/EmuInstance.h
index c0d5dca6..8f5a6256 100644
--- a/src/frontend/qt_sdl/EmuInstance.h
+++ b/src/frontend/qt_sdl/EmuInstance.h
@@ -90,6 +90,9 @@ public:
 
     void osdAddMessage(unsigned int color, const char* fmt, ...);
 
+    bool emuIsActive();
+    void emuStop(melonDS::Platform::StopReason reason);
+
     bool usesOpenGL();
     void initOpenGL();
     void deinitOpenGL();
diff --git a/src/frontend/qt_sdl/EmuSettingsDialog.cpp b/src/frontend/qt_sdl/EmuSettingsDialog.cpp
index 8d4f098e..f907f258 100644
--- a/src/frontend/qt_sdl/EmuSettingsDialog.cpp
+++ b/src/frontend/qt_sdl/EmuSettingsDialog.cpp
@@ -32,8 +32,6 @@ using namespace melonDS;
 
 EmuSettingsDialog* EmuSettingsDialog::currentDlg = nullptr;
 
-extern bool RunningSomething;
-
 bool EmuSettingsDialog::needsReset = false;
 
 inline void EmuSettingsDialog::updateLastBIOSFolder(QString& filename)
@@ -246,7 +244,7 @@ void EmuSettingsDialog::done(int r)
 
         if (modified)
         {
-            if (RunningSomething
+            if (emuInstance->emuIsActive()
                 && QMessageBox::warning(this, "Reset necessary to apply changes",
                     "The emulation will be reset for the changes to take place.",
                     QMessageBox::Ok, QMessageBox::Cancel) != QMessageBox::Ok)
diff --git a/src/frontend/qt_sdl/EmuThread.cpp b/src/frontend/qt_sdl/EmuThread.cpp
index b27087b3..536643e4 100644
--- a/src/frontend/qt_sdl/EmuThread.cpp
+++ b/src/frontend/qt_sdl/EmuThread.cpp
@@ -55,18 +55,9 @@
 #include "Savestate.h"
 
 #include "EmuInstance.h"
-//#include "ArchiveUtil.h"
-//#include "CameraManager.h"
 
-//#include "CLI.h"
-
-// TODO: uniform variable spelling
 using namespace melonDS;
 
-// TEMP
-extern bool RunningSomething;
-//extern MainWindow* mainWindow;
-
 
 EmuThread::EmuThread(EmuInstance* inst, QObject* parent) : QThread(parent)
 {
@@ -75,7 +66,7 @@ EmuThread::EmuThread(EmuInstance* inst, QObject* parent) : QThread(parent)
     EmuStatus = emuStatus_Exit;
     EmuRunning = emuStatus_Paused;
     EmuPauseStack = EmuPauseStackRunning;
-    RunningSomething = false;
+    emuActive = false;
 }
 
 void EmuThread::attachWindow(MainWindow* window)
@@ -494,7 +485,7 @@ void EmuThread::emuRun()
 {
     EmuRunning = emuStatus_Running;
     EmuPauseStack = EmuPauseStackRunning;
-    RunningSomething = true;
+    emuActive = true;
 
     // checkme
     emit windowEmuStart();
@@ -538,6 +529,12 @@ void EmuThread::emuUnpause()
 }
 
 void EmuThread::emuStop()
+{
+    emuPause();
+    emuActive = false;
+}
+
+void EmuThread::emuExit()
 {
     EmuRunning = emuStatus_Exit;
     EmuPauseStack = EmuPauseStackRunning;
@@ -558,7 +555,7 @@ bool EmuThread::emuIsRunning()
 
 bool EmuThread::emuIsActive()
 {
-    return (RunningSomething == 1);
+    return emuActive;
 }
 
 void EmuThread::updateRenderer()
diff --git a/src/frontend/qt_sdl/EmuThread.h b/src/frontend/qt_sdl/EmuThread.h
index 638c6f01..4e6f592f 100644
--- a/src/frontend/qt_sdl/EmuThread.h
+++ b/src/frontend/qt_sdl/EmuThread.h
@@ -60,6 +60,7 @@ public:
     void emuPause();
     void emuUnpause();
     void emuStop();
+    void emuExit();
     void emuFrameStep();
 
     bool emuIsRunning();
@@ -108,6 +109,7 @@ private:
 
     EmuStatusKind PrevEmuStatus;
     EmuStatusKind EmuRunning;
+    bool emuActive;
 
     constexpr static int EmuPauseStackRunning = 0;
     constexpr static int EmuPauseStackPauseThreshold = 1;
diff --git a/src/frontend/qt_sdl/FirmwareSettingsDialog.cpp b/src/frontend/qt_sdl/FirmwareSettingsDialog.cpp
index 5a79391d..27bb8f4d 100644
--- a/src/frontend/qt_sdl/FirmwareSettingsDialog.cpp
+++ b/src/frontend/qt_sdl/FirmwareSettingsDialog.cpp
@@ -30,8 +30,6 @@ namespace Platform = melonDS::Platform;
 
 FirmwareSettingsDialog* FirmwareSettingsDialog::currentDlg = nullptr;
 
-extern bool RunningSomething;
-
 bool FirmwareSettingsDialog::needsReset = false;
 
 FirmwareSettingsDialog::FirmwareSettingsDialog(QWidget* parent) : QDialog(parent), ui(new Ui::FirmwareSettingsDialog)
@@ -169,7 +167,7 @@ void FirmwareSettingsDialog::done(int r)
 
         if (modified)
         {
-            if (RunningSomething
+            if (emuInstance->emuIsActive()
                 && QMessageBox::warning(this, "Reset necessary to apply changes",
                     "The emulation will be reset for the changes to take place.",
                     QMessageBox::Ok, QMessageBox::Cancel) != QMessageBox::Ok)
diff --git a/src/frontend/qt_sdl/MPSettingsDialog.cpp b/src/frontend/qt_sdl/MPSettingsDialog.cpp
index 957a8019..0b9c2a3c 100644
--- a/src/frontend/qt_sdl/MPSettingsDialog.cpp
+++ b/src/frontend/qt_sdl/MPSettingsDialog.cpp
@@ -34,8 +34,6 @@
 
 MPSettingsDialog* MPSettingsDialog::currentDlg = nullptr;
 
-extern bool RunningSomething;
-
 
 MPSettingsDialog::MPSettingsDialog(QWidget* parent) : QDialog(parent), ui(new Ui::MPSettingsDialog)
 {
diff --git a/src/frontend/qt_sdl/PathSettingsDialog.cpp b/src/frontend/qt_sdl/PathSettingsDialog.cpp
index c9c4d0df..0e9abb09 100644
--- a/src/frontend/qt_sdl/PathSettingsDialog.cpp
+++ b/src/frontend/qt_sdl/PathSettingsDialog.cpp
@@ -34,8 +34,6 @@ namespace Platform = melonDS::Platform;
 
 PathSettingsDialog* PathSettingsDialog::currentDlg = nullptr;
 
-extern bool RunningSomething;
-
 bool PathSettingsDialog::needsReset = false;
 
 constexpr char errordialog[] = "melonDS cannot write to that directory.";
@@ -97,7 +95,7 @@ void PathSettingsDialog::done(int r)
 
         if (modified)
         {
-            if (RunningSomething
+            if (emuInstance->emuIsActive()
                 && QMessageBox::warning(this, "Reset necessary to apply changes",
                     "The emulation will be reset for the changes to take place.",
                     QMessageBox::Ok, QMessageBox::Cancel) != QMessageBox::Ok)
diff --git a/src/frontend/qt_sdl/Platform.cpp b/src/frontend/qt_sdl/Platform.cpp
index 65f435da..f1af2935 100644
--- a/src/frontend/qt_sdl/Platform.cpp
+++ b/src/frontend/qt_sdl/Platform.cpp
@@ -63,22 +63,7 @@ namespace melonDS::Platform
 void SignalStop(StopReason reason, void* userdata)
 {
     EmuInstance* inst = (EmuInstance*)userdata;
-    emuStop();
-    switch (reason)
-    {
-        case StopReason::GBAModeNotSupported:
-            Log(LogLevel::Error, "!! GBA MODE NOT SUPPORTED\n");
-            //mainWindow->osdAddMessage(0xFFA0A0, "GBA mode not supported.");
-            break;
-        case StopReason::BadExceptionRegion:
-            //mainWindow->osdAddMessage(0xFFA0A0, "Internal error.");
-            break;
-        case StopReason::PowerOff:
-        case StopReason::External:
-            //mainWindow->osdAddMessage(0xFFC040, "Shutdown");
-        default:
-            break;
-    }
+    inst->emuStop(reason);
 }
 
 
diff --git a/src/frontend/qt_sdl/WifiSettingsDialog.cpp b/src/frontend/qt_sdl/WifiSettingsDialog.cpp
index d7ab5d8e..0b99216d 100644
--- a/src/frontend/qt_sdl/WifiSettingsDialog.cpp
+++ b/src/frontend/qt_sdl/WifiSettingsDialog.cpp
@@ -43,8 +43,6 @@ WifiSettingsDialog* WifiSettingsDialog::currentDlg = nullptr;
 
 bool WifiSettingsDialog::needsReset = false;
 
-extern bool RunningSomething;
-
 
 WifiSettingsDialog::WifiSettingsDialog(QWidget* parent) : QDialog(parent), ui(new Ui::WifiSettingsDialog)
 {
diff --git a/src/frontend/qt_sdl/Window.cpp b/src/frontend/qt_sdl/Window.cpp
index 01f9d49a..bda0df27 100644
--- a/src/frontend/qt_sdl/Window.cpp
+++ b/src/frontend/qt_sdl/Window.cpp
@@ -82,32 +82,62 @@
 
 using namespace melonDS;
 
-// TEMP
-extern MainWindow* mainWindow;
-//extern EmuThread* emuThread;
-extern bool RunningSomething;
-extern QString NdsRomMimeType;
-extern QStringList NdsRomExtensions;
-extern QString GbaRomMimeType;
-extern QStringList GbaRomExtensions;
-extern QStringList ArchiveMimeTypes;
-extern QStringList ArchiveExtensions;
-/*static bool FileExtensionInList(const QString& filename, const QStringList& extensions, Qt::CaseSensitivity cs);
-static bool MimeTypeInList(const QMimeType& mimetype, const QStringList& superTypeNames);
-static bool NdsRomByExtension(const QString& filename);
-static bool GbaRomByExtension(const QString& filename);
-static bool SupportedArchiveByExtension(const QString& filename);
-static bool NdsRomByMimetype(const QMimeType& mimetype);
-static bool GbaRomByMimetype(const QMimeType& mimetype);
-static bool SupportedArchiveByMimetype(const QMimeType& mimetype);
-static bool ZstdNdsRomByExtension(const QString& filename);
-static bool ZstdGbaRomByExtension(const QString& filename);
-static bool FileIsSupportedFiletype(const QString& filename, bool insideArchive);*/
+
+
 
 extern CameraManager* camManager[2];
 extern bool camStarted[2];
 
 
+QString NdsRomMimeType = "application/x-nintendo-ds-rom";
+QStringList NdsRomExtensions { ".nds", ".srl", ".dsi", ".ids" };
+
+QString GbaRomMimeType = "application/x-gba-rom";
+QStringList GbaRomExtensions { ".gba", ".agb" };
+
+
+// This list of supported archive formats is based on libarchive(3) version 3.6.2 (2022-12-09).
+QStringList ArchiveMimeTypes
+{
+#ifdef ARCHIVE_SUPPORT_ENABLED
+    "application/zip",
+    "application/x-7z-compressed",
+    "application/vnd.rar", // *.rar
+    "application/x-tar",
+
+    "application/x-compressed-tar", // *.tar.gz
+    "application/x-xz-compressed-tar",
+    "application/x-bzip-compressed-tar",
+    "application/x-lz4-compressed-tar",
+    "application/x-zstd-compressed-tar",
+
+    "application/x-tarz", // *.tar.Z
+    "application/x-lzip-compressed-tar",
+    "application/x-lzma-compressed-tar",
+    "application/x-lrzip-compressed-tar",
+    "application/x-tzo", // *.tar.lzo
+#endif
+};
+
+QStringList ArchiveExtensions
+{
+#ifdef ARCHIVE_SUPPORT_ENABLED
+    ".zip", ".7z", ".rar", ".tar",
+
+    ".tar.gz", ".tgz",
+    ".tar.xz", ".txz",
+    ".tar.bz2", ".tbz2",
+    ".tar.lz4", ".tlz4",
+    ".tar.zst", ".tzst",
+
+    ".tar.Z", ".taz",
+    ".tar.lz",
+    ".tar.lzma", ".tlz",
+    ".tar.lrz", ".tlrz",
+    ".tar.lzo", ".tzo"
+#endif
+};
+
 // AAAAAAA
 static bool FileExtensionInList(const QString& filename, const QStringList& extensions, Qt::CaseSensitivity cs = Qt::CaseInsensitive)
 {
@@ -1515,7 +1545,7 @@ void MainWindow::onImportSavefile()
         return;
     }
 
-    if (RunningSomething)
+    if (emuThread->emuIsActive())
     {
         if (QMessageBox::warning(this,
                         "melonDS",
@@ -1553,7 +1583,7 @@ void MainWindow::onQuit()
 
 void MainWindow::onPause(bool checked)
 {
-    if (!RunningSomething) return;
+    if (!emuThread->emuIsActive()) return;
 
     if (checked)
     {
@@ -1571,7 +1601,7 @@ void MainWindow::onPause(bool checked)
 
 void MainWindow::onReset()
 {
-    if (!RunningSomething) return;
+    if (!emuThread->emuIsActive()) return;
 
     emuThread->emuPause();
 
@@ -1585,7 +1615,7 @@ void MainWindow::onReset()
 
 void MainWindow::onStop()
 {
-    if (!RunningSomething) return;
+    if (!emuThread->emuIsActive()) return;
 
     emuThread->emuPause();
     emuInstance->nds->Stop();
@@ -1593,7 +1623,7 @@ void MainWindow::onStop()
 
 void MainWindow::onFrameStep()
 {
-    if (!RunningSomething) return;
+    if (!emuThread->emuIsActive()) return;
 
     emuThread->emuFrameStep();
 }
@@ -1693,7 +1723,7 @@ void MainWindow::onEmuSettingsDialogFinished(int res)
 
     actCurrentGBACart->setText("GBA slot: " + emuInstance->gbaCartLabel());
 
-    if (!RunningSomething)
+    if (!emuThread->emuIsActive())
         actTitleManager->setEnabled(!globalCfg.GetString("DSi.NANDPath").empty());
 }
 
@@ -2049,7 +2079,7 @@ void MainWindow::onEmuStart()
 
 void MainWindow::onEmuStop()
 {
-    emuThread->emuPause();
+    emuThread->emuStop();
 
     for (int i = 0; i < 9; i++)
     {
diff --git a/src/frontend/qt_sdl/main.cpp b/src/frontend/qt_sdl/main.cpp
index e23fe0ec..1843aa5a 100644
--- a/src/frontend/qt_sdl/main.cpp
+++ b/src/frontend/qt_sdl/main.cpp
@@ -77,145 +77,61 @@
 
 #include "CLI.h"
 
-// TODO: uniform variable spelling
 using namespace melonDS;
-QString NdsRomMimeType = "application/x-nintendo-ds-rom";
-QStringList NdsRomExtensions { ".nds", ".srl", ".dsi", ".ids" };
-
-QString GbaRomMimeType = "application/x-gba-rom";
-QStringList GbaRomExtensions { ".gba", ".agb" };
 
 QString* systemThemeName;
 
-// This list of supported archive formats is based on libarchive(3) version 3.6.2 (2022-12-09).
-QStringList ArchiveMimeTypes
-{
-#ifdef ARCHIVE_SUPPORT_ENABLED
-    "application/zip",
-    "application/x-7z-compressed",
-    "application/vnd.rar", // *.rar
-    "application/x-tar",
 
-    "application/x-compressed-tar", // *.tar.gz
-    "application/x-xz-compressed-tar",
-    "application/x-bzip-compressed-tar",
-    "application/x-lz4-compressed-tar",
-    "application/x-zstd-compressed-tar",
-
-    "application/x-tarz", // *.tar.Z
-    "application/x-lzip-compressed-tar",
-    "application/x-lzma-compressed-tar",
-    "application/x-lrzip-compressed-tar",
-    "application/x-tzo", // *.tar.lzo
-#endif
-};
-
-QStringList ArchiveExtensions
-{
-#ifdef ARCHIVE_SUPPORT_ENABLED
-    ".zip", ".7z", ".rar", ".tar",
-
-    ".tar.gz", ".tgz",
-    ".tar.xz", ".txz",
-    ".tar.bz2", ".tbz2",
-    ".tar.lz4", ".tlz4",
-    ".tar.zst", ".tzst",
-
-    ".tar.Z", ".taz",
-    ".tar.lz",
-    ".tar.lzma", ".tlz",
-    ".tar.lrz", ".tlrz",
-    ".tar.lzo", ".tzo"
-#endif
-};
 
 QString emuDirectory;
 
-bool RunningSomething;
-
 //MainWindow* mainWindow;
 //EmuThread* emuThread;
 EmuInstance* testinst;
 
+const int kMaxEmuInstances = 16;
+EmuInstance* emuInstances[kMaxEmuInstances];
+
 CameraManager* camManager[2];
 bool camStarted[2];
 
 
-
-
-
-static bool FileExtensionInList(const QString& filename, const QStringList& extensions, Qt::CaseSensitivity cs = Qt::CaseInsensitive)
+bool createEmuInstance()
 {
-    return std::any_of(extensions.cbegin(), extensions.cend(), [&](const auto& ext) {
-        return filename.endsWith(ext, cs);
-    });
+    int id = -1;
+    for (int i = 0; i < kMaxEmuInstances; i++)
+    {
+        if (!emuInstances[i])
+        {
+            id = i;
+            break;
+        }
+    }
+
+    if (id == -1)
+        return false;
+
+    auto inst = new EmuInstance(id);
+    emuInstances[id] = inst;
+
+    return true;
 }
 
-static bool MimeTypeInList(const QMimeType& mimetype, const QStringList& superTypeNames)
+void deleteEmuInstance(int id)
 {
-    return std::any_of(superTypeNames.cbegin(), superTypeNames.cend(), [&](const auto& superTypeName) {
-        return mimetype.inherits(superTypeName);
-    });
+    auto inst = emuInstances[id];
+    if (!inst) return;
+
+    delete inst;
+    emuInstances[id] = nullptr;
 }
 
-
-static bool NdsRomByExtension(const QString& filename)
+void deleteAllEmuInstances()
 {
-    return FileExtensionInList(filename, NdsRomExtensions);
+    for (int i = 0; i < kMaxEmuInstances; i++)
+        deleteEmuInstance(i);
 }
 
-static bool GbaRomByExtension(const QString& filename)
-{
-    return FileExtensionInList(filename, GbaRomExtensions);
-}
-
-static bool SupportedArchiveByExtension(const QString& filename)
-{
-    return FileExtensionInList(filename, ArchiveExtensions);
-}
-
-
-static bool NdsRomByMimetype(const QMimeType& mimetype)
-{
-    return mimetype.inherits(NdsRomMimeType);
-}
-
-static bool GbaRomByMimetype(const QMimeType& mimetype)
-{
-    return mimetype.inherits(GbaRomMimeType);
-}
-
-static bool SupportedArchiveByMimetype(const QMimeType& mimetype)
-{
-    return MimeTypeInList(mimetype, ArchiveMimeTypes);
-}
-
-static bool ZstdNdsRomByExtension(const QString& filename)
-{
-    return filename.endsWith(".zst", Qt::CaseInsensitive) &&
-        NdsRomByExtension(filename.left(filename.size() - 4));
-}
-
-static bool ZstdGbaRomByExtension(const QString& filename)
-{
-    return filename.endsWith(".zst", Qt::CaseInsensitive) &&
-        GbaRomByExtension(filename.left(filename.size() - 4));
-}
-
-static bool FileIsSupportedFiletype(const QString& filename, bool insideArchive = false)
-{
-    if (ZstdNdsRomByExtension(filename) || ZstdGbaRomByExtension(filename))
-        return true;
-
-    if (NdsRomByExtension(filename) || GbaRomByExtension(filename) || SupportedArchiveByExtension(filename))
-        return true;
-
-    const auto matchmode = insideArchive ? QMimeDatabase::MatchExtension : QMimeDatabase::MatchDefault;
-    const QMimeType mimetype = QMimeDatabase().mimeTypeForFile(filename, matchmode);
-    return NdsRomByMimetype(mimetype) || GbaRomByMimetype(mimetype) || SupportedArchiveByMimetype(mimetype);
-}
-
-
 
 void pathInit()
 {
@@ -254,12 +170,6 @@ void pathInit()
 }
 
 
-void emuStop()
-{
-    RunningSomething = false;
-
-    //emit emuThread->windowEmuStop();
-}
 
 MelonApplication::MelonApplication(int& argc, char** argv)
     : QApplication(argc, argv)
@@ -291,6 +201,9 @@ int main(int argc, char** argv)
 {
     srand(time(nullptr));
 
+    for (int i = 0; i < kMaxEmuInstances; i++)
+        emuInstances[i] = nullptr;
+
     qputenv("QT_SCALE_FACTOR", "1");
 
 #if QT_VERSION_MAJOR == 6 && defined(__WIN32__)