diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9dae556..9af0253 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,7 +21,7 @@ ob_standard_project_setup()
 
 # Additional Project Variables
 set(PROJECT_FORMAL_NAME "CLI Flashpoint")
-set(TARGET_FP_VERSION_PREFIX 12.0)
+set(TARGET_FP_VERSION_PREFIX 12.1)
 
 # Configuration options
 # Handled by fetched libs, but set this here formally since they aren't part of the main project
@@ -79,7 +79,7 @@ ob_fetch_qx(
 
 # Fetch libfp (build and import from source)
 include(OB/Fetchlibfp)
-ob_fetch_libfp("v0.5")
+ob_fetch_libfp("v0.5.1")
 
 # Fetch QI-QMP (build and import from source)
 include(OB/FetchQI-QMP)
diff --git a/app/src/kernel/driver.h b/app/src/kernel/driver.h
index bfbff3a..f57a8e3 100644
--- a/app/src/kernel/driver.h
+++ b/app/src/kernel/driver.h
@@ -66,7 +66,7 @@ class Driver : public QObject
 
     // Error Messages
     static inline const QString ERR_LAUNCHER_RUNNING_TIP = u"Please close the Launcher first."_s;
-    static inline const QString ERR_INSTALL_INVALID_TIP = u"Check its location and compatibility with your Flashpoint version."_s;
+    static inline const QString ERR_INSTALL_INVALID_TIP = u"You may need to update CLIFp."_s;
 
     // Logging
     static inline const QString LOG_EVENT_FLASHPOINT_SEARCH = u"Searching for Flashpoint root..."_s;
diff --git a/app/src/task/t-mount.cpp b/app/src/task/t-mount.cpp
index 6de84cb..934f471 100644
--- a/app/src/task/t-mount.cpp
+++ b/app/src/task/t-mount.cpp
@@ -75,7 +75,7 @@ void TMount::perform()
 
     //-Setup Mounter(s)------------------------------------
 
-    if(mDaemon == Fp::Daemon::FpProxy)
+    if(mDaemon == Fp::Daemon::FpProxy || mDaemon == Fp::Daemon::FpGameServer)
     {
         initMounter(mMounterProxy);
         mMounterProxy->setFilePath(mPath);
@@ -122,6 +122,7 @@ void TMount::perform()
     switch(mDaemon)
     {
         case Fp::Daemon::FpProxy:
+        case Fp::Daemon::FpGameServer:
             mMounterProxy->mount();
             break;
 
diff --git a/app/src/tools/mounter_proxy.cpp b/app/src/tools/mounter_proxy.cpp
index 3c63caa..1eff247 100644
--- a/app/src/tools/mounter_proxy.cpp
+++ b/app/src/tools/mounter_proxy.cpp
@@ -4,6 +4,9 @@
 // Qt Includes
 #include <QAuthenticator>
 #include <QUrlQuery>
+#include <QDir>
+#include <QJsonObject>
+#include <QJsonDocument>
 
 // Qx Includes
 #include <qx/core/qx-string.h>
@@ -96,7 +99,7 @@ quint16 MounterProxy::proxyServerPort() const { return mProxyServerPort; }
 QString MounterProxy::filePath() const { return mFilePath; }
 
 void MounterProxy::setProxyServerPort(quint16 port) { mProxyServerPort = port; }
-void MounterProxy::setFilePath(const QString& path) { mFilePath = path; }
+void MounterProxy::setFilePath(const QString& path) { mFilePath = QDir::toNativeSeparators(path); }
 
 //-Signals & Slots------------------------------------------------------------------------------------------------------------
 //Private Slots:
@@ -139,9 +142,15 @@ void MounterProxy::mount()
 
     // Header
     mountReq.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
-
-    // Data (could use QJsonDocument but for such a simple object that's overkill
-    QByteArray data = "{\"filePath\":\""_ba + mFilePath.toLatin1() + "\"}"_ba;
+    // These headers are used by the stock launcher, but don't seem to be needed
+    //
+    // mountReq.setRawHeader("Connection"_ba, "close"_ba);
+    // mountReq.setRawHeader("Accept"_ba, "application/json, text/plain, */*"_ba);
+    // mountReq.setRawHeader("Accept-Encoding"_ba, "gzip, compress, deflate, br"_ba);
+
+    // Data
+    QJsonDocument jdData(QJsonObject{{u"filePath"_s, mFilePath}});
+    QByteArray data = jdData.toJson(QJsonDocument::Compact);
 
     //-POST Request---------------------------------
     mProxyMountReply = mNam.post(mountReq, data);