diff --git a/launcher/FileSystem.cpp b/launcher/FileSystem.cpp
index 7bfa24de9..b909ad614 100644
--- a/launcher/FileSystem.cpp
+++ b/launcher/FileSystem.cpp
@@ -1594,4 +1594,44 @@ uintmax_t hardLinkCount(const QString& path)
     return count;
 }
 
+#ifdef Q_OS_WIN
+// returns 8.3 file format from long path
+QString shortPathName(const QString& file)
+{
+    auto input = file.toStdWString();
+    std::wstring output;
+    long length = GetShortPathNameW(input.c_str(), NULL, 0);
+    if (length == 0)
+        return {};
+    // NOTE: this resizing might seem weird...
+    // when GetShortPathNameW fails, it returns length including null character
+    // when it succeeds, it returns length excluding null character
+    // See: https://msdn.microsoft.com/en-us/library/windows/desktop/aa364989(v=vs.85).aspx
+    output.resize(length);
+    if (GetShortPathNameW(input.c_str(), (LPWSTR)output.c_str(), length) == 0)
+        return {};
+    output.resize(length - 1);
+    QString ret = QString::fromStdWString(output);
+    return ret;
+}
+
+// if the string survives roundtrip through local 8bit encoding...
+bool fitsInLocal8bit(const QString& string)
+{
+    return string == QString::fromLocal8Bit(string.toLocal8Bit());
+}
+
+QString getPathNameInLocal8bit(const QString& file)
+{
+    if (!fitsInLocal8bit(file)) {
+        auto path = shortPathName(file);
+        if (!path.isEmpty()) {
+            return path;
+        }
+        // in case shortPathName fails just return the path as is
+    }
+    return file;
+}
+#endif
+
 }  // namespace FS
diff --git a/launcher/FileSystem.h b/launcher/FileSystem.h
index 1c9ba2672..5496c3795 100644
--- a/launcher/FileSystem.h
+++ b/launcher/FileSystem.h
@@ -553,4 +553,8 @@ bool canLink(const QString& src, const QString& dst);
 
 uintmax_t hardLinkCount(const QString& path);
 
+#ifdef Q_OS_WIN
+QString getPathNameInLocal8bit(const QString& file);
+#endif
+
 }  // namespace FS
diff --git a/launcher/InstanceImportTask.h b/launcher/InstanceImportTask.h
index a1cf2560b..28efd7ec5 100644
--- a/launcher/InstanceImportTask.h
+++ b/launcher/InstanceImportTask.h
@@ -47,9 +47,6 @@
 #include <optional>
 
 class QuaZip;
-namespace Flame {
-class FileResolvingTask;
-}
 
 class InstanceImportTask : public InstanceTask {
     Q_OBJECT
@@ -79,7 +76,6 @@ class InstanceImportTask : public InstanceTask {
 
    private: /* data */
     NetJob::Ptr m_filesNetJob;
-    shared_qobject_ptr<Flame::FileResolvingTask> m_modIdResolver;
     QUrl m_sourceUrl;
     QString m_archivePath;
     bool m_downloadRequired = false;
diff --git a/launcher/java/JavaChecker.cpp b/launcher/java/JavaChecker.cpp
index 20caba189..fc8da55c2 100644
--- a/launcher/java/JavaChecker.cpp
+++ b/launcher/java/JavaChecker.cpp
@@ -55,6 +55,9 @@ void JavaChecker::performCheck()
         qDebug() << "Java checker library could not be found. Please check your installation.";
         return;
     }
+#ifdef Q_OS_WIN
+    checkerJar = FS::getPathNameInLocal8bit(checkerJar);
+#endif
 
     QStringList args;
 
diff --git a/launcher/minecraft/launch/ExtractNatives.cpp b/launcher/minecraft/launch/ExtractNatives.cpp
index 8f3cac4d1..405008f40 100644
--- a/launcher/minecraft/launch/ExtractNatives.cpp
+++ b/launcher/minecraft/launch/ExtractNatives.cpp
@@ -79,6 +79,7 @@ void ExtractNatives::executeTask()
     auto settings = minecraftInstance->settings();
 
     auto outputPath = minecraftInstance->getNativePath();
+    FS::ensureFolderPathExists(outputPath);
     auto javaVersion = minecraftInstance->getJavaVersion();
     bool jniHackEnabled = javaVersion.major() >= 8;
     for (const auto& source : toExtract) {
diff --git a/launcher/minecraft/launch/ExtractNatives.h b/launcher/minecraft/launch/ExtractNatives.h
index 2ab8816bd..4837a9dbb 100644
--- a/launcher/minecraft/launch/ExtractNatives.h
+++ b/launcher/minecraft/launch/ExtractNatives.h
@@ -16,8 +16,6 @@
 #pragma once
 
 #include <launch/LaunchStep.h>
-#include <memory>
-#include "minecraft/auth/AuthSession.h"
 
 // FIXME: temporary wrapper for existing task.
 class ExtractNatives : public LaunchStep {
diff --git a/launcher/minecraft/launch/LauncherPartLaunch.cpp b/launcher/minecraft/launch/LauncherPartLaunch.cpp
index aa94edb5d..4e021c4a8 100644
--- a/launcher/minecraft/launch/LauncherPartLaunch.cpp
+++ b/launcher/minecraft/launch/LauncherPartLaunch.cpp
@@ -66,32 +66,6 @@ LauncherPartLaunch::LauncherPartLaunch(LaunchTask* parent) : LaunchStep(parent)
     connect(&m_process, &LoggedProcess::stateChanged, this, &LauncherPartLaunch::on_state);
 }
 
-#ifdef Q_OS_WIN
-// returns 8.3 file format from long path
-#include <windows.h>
-QString shortPathName(const QString& file)
-{
-    auto input = file.toStdWString();
-    std::wstring output;
-    long length = GetShortPathNameW(input.c_str(), NULL, 0);
-    // NOTE: this resizing might seem weird...
-    // when GetShortPathNameW fails, it returns length including null character
-    // when it succeeds, it returns length excluding null character
-    // See: https://msdn.microsoft.com/en-us/library/windows/desktop/aa364989(v=vs.85).aspx
-    output.resize(length);
-    GetShortPathNameW(input.c_str(), (LPWSTR)output.c_str(), length);
-    output.resize(length - 1);
-    QString ret = QString::fromStdWString(output);
-    return ret;
-}
-#endif
-
-// if the string survives roundtrip through local 8bit encoding...
-bool fitsInLocal8bit(const QString& string)
-{
-    return string == QString::fromLocal8Bit(string.toLocal8Bit());
-}
-
 void LauncherPartLaunch::executeTask()
 {
     QString jarPath = APPLICATION->getJarPath("NewLaunch.jar");
@@ -136,24 +110,15 @@ void LauncherPartLaunch::executeTask()
 
     auto natPath = minecraftInstance->getNativePath();
 #ifdef Q_OS_WIN
-    if (!fitsInLocal8bit(natPath)) {
-        args << "-Djava.library.path=" + shortPathName(natPath);
-    } else {
-        args << "-Djava.library.path=" + natPath;
-    }
-#else
-    args << "-Djava.library.path=" + natPath;
+    natPath = FS::getPathNameInLocal8bit(natPath);
 #endif
+    args << "-Djava.library.path=" + natPath;
 
     args << "-cp";
 #ifdef Q_OS_WIN
     QStringList processed;
     for (auto& item : classPath) {
-        if (!fitsInLocal8bit(item)) {
-            processed << shortPathName(item);
-        } else {
-            processed << item;
-        }
+        processed << FS::getPathNameInLocal8bit(item);
     }
     args << processed.join(';');
 #else