diff --git a/src/blackmisc/fileutils.cpp b/src/blackmisc/fileutils.cpp
index ed0fa73ac..c659a20de 100644
--- a/src/blackmisc/fileutils.cpp
+++ b/src/blackmisc/fileutils.cpp
@@ -114,6 +114,11 @@ namespace BlackMisc
         return QDir::cleanPath(path1 + QChar('/') + path2);
     }
 
+    QString CFileUtils::appendFilePathsAndFixUnc(const QString &path1, const QString &path2)
+    {
+        return CFileUtils::fixWindowsUncPath(appendFilePaths(path1, path2));
+    }
+
     QString CFileUtils::stripFileFromPath(const QString &path)
     {
         if (path.endsWith('/'))  { return path; }
@@ -126,6 +131,11 @@ namespace BlackMisc
         return CFileUtils::appendFilePaths(CFileUtils::appendFilePaths(path1, path2), path3);
     }
 
+    QString CFileUtils::appendFilePathsAndFixUnc(const QString &path1, const QString &path2, const QString &path3)
+    {
+        return CFileUtils::fixWindowsUncPath(CFileUtils::appendFilePaths(CFileUtils::appendFilePaths(path1, path2), path3));
+    }
+
     bool CFileUtils::copyRecursively(const QString &sourceDir, const QString &destinationDir)
     {
         QFileInfo sourceFileInfo(sourceDir);
diff --git a/src/blackmisc/fileutils.h b/src/blackmisc/fileutils.h
index bd01f8a53..528a8167c 100644
--- a/src/blackmisc/fileutils.h
+++ b/src/blackmisc/fileutils.h
@@ -67,13 +67,21 @@ namespace BlackMisc
         //! \sa CNetworkUtils::buildUrl for URLs
         static QString appendFilePaths(const QString &path1, const QString &path2);
 
-        //! Strip file from path a/b/c.json a/b
-        static QString stripFileFromPath(const QString &path);
+        //! Append file paths
+        //! \sa CNetworkUtils::buildUrl for URLs
+        static QString appendFilePathsAndFixUnc(const QString &path1, const QString &path2);
 
         //! Append file paths
         //! \sa CNetworkUtils::buildUrl for URLs
         static QString appendFilePaths(const QString &path1, const QString &path2, const QString &path3);
 
+        //! Append file paths
+        //! \sa CNetworkUtils::buildUrl for URLs
+        static QString appendFilePathsAndFixUnc(const QString &path1, const QString &path2, const QString &path3);
+
+        //! Strip file from path a/b/c.json a/b
+        static QString stripFileFromPath(const QString &path);
+
         //! If `sourceDir` is a directory, copies it recursively, so that `sourceDir` becomes `destinationDir`.
         //! If it is a file, just copies the file.
         static bool copyRecursively(const QString &sourceDir, const QString &destinationDir);
diff --git a/src/blackmisc/simulation/settings/simulatorsettings.cpp b/src/blackmisc/simulation/settings/simulatorsettings.cpp
index cfc8dbb35..1735d378d 100644
--- a/src/blackmisc/simulation/settings/simulatorsettings.cpp
+++ b/src/blackmisc/simulation/settings/simulatorsettings.cpp
@@ -567,7 +567,7 @@ namespace BlackMisc
 
             const QString CXPlaneSimulatorSettings::getPluginDirOrDefault() const
             {
-                return CFileUtils::appendFilePaths(this->getSimulatorDirectoryOrDefault(), CXPlaneUtil::xplanePluginPath());
+                return CFileUtils::appendFilePathsAndFixUnc(this->getSimulatorDirectoryOrDefault(), CXPlaneUtil::xplanePluginPath());
             }
         } // ns
     } // ns