diff --git a/src/Deploy/src/deploycore.cpp b/src/Deploy/src/deploycore.cpp
index 425f0e4..543cfd0 100644
--- a/src/Deploy/src/deploycore.cpp
+++ b/src/Deploy/src/deploycore.cpp
@@ -677,7 +677,8 @@ QString DeployCore::findProcess(const QString &env, const QString& proc, bool ig
 }
 
 QStringList DeployCore::debugExtensions() {
-    return {".debug", "d.dll", ".pdb"};
+    // from 6.5 windows version of Qt use a "gebug" extansion too.
+    return {".debug", ".pdb"};
 }
 
 bool DeployCore::isDebugFile(const QString &file) {
diff --git a/src/Deploy/src/distromodule.cpp b/src/Deploy/src/distromodule.cpp
index cf1063b..aaff833 100644
--- a/src/Deploy/src/distromodule.cpp
+++ b/src/Deploy/src/distromodule.cpp
@@ -77,7 +77,7 @@ void DistroModule::setPublisher(const QString &publisher) {
     _publisher = publisher;
 }
 
-QSet<QString> DistroModule::enabledPlugins() const {
+const QSet<QString>& DistroModule::enabledPlugins() const {
     return _enabled;
 }
 
@@ -89,7 +89,7 @@ void DistroModule::addEnabledPlugins(const QString &enabled) {
     _enabled += enabled;
 }
 
-QSet<QString> DistroModule::disabledPlugins() const {
+const QSet<QString>& DistroModule::disabledPlugins() const {
     return _disabled;
 }
 
@@ -101,7 +101,7 @@ void DistroModule::addDisabledPlugins(const QString &disabled) {
     _disabled += disabled;
 }
 
-QSet<QString> DistroModule::extraPlugins() const {
+const QSet<QString> &DistroModule::extraPlugins() const {
     return _extraPlugins;
 }
 
@@ -175,7 +175,7 @@ void DistroModule::setInstallDirDEB(const QString &newInstallDir) {
     _installDirDEB = newInstallDir;
 }
 
-QSet<QString> DistroModule::translation() const {
+const QSet<QString> &DistroModule::translation() const {
     return _tr;
 }
 
@@ -187,7 +187,7 @@ void DistroModule::addTranslation(const QString &tr) {
     _tr += tr;
 }
 
-QSet<QString> DistroModule::extraData() const {
+const QSet<QString> &DistroModule::extraData() const {
     return _extraData;
 }
 
diff --git a/src/Deploy/src/distromodule.h b/src/Deploy/src/distromodule.h
index 0b8e77c..4d68d8b 100644
--- a/src/Deploy/src/distromodule.h
+++ b/src/Deploy/src/distromodule.h
@@ -42,15 +42,15 @@ public:
     QString publisher() const;
     void setPublisher(const QString &publisher);
 
-    QSet<QString> enabledPlugins() const;
+    const QSet<QString> &enabledPlugins() const;
     void setEnabledPlugins(const QSet<QString> &enabled);
     void addEnabledPlugins(const QString &enabled);
 
-    QSet<QString> disabledPlugins() const;
+    const QSet<QString> &disabledPlugins() const;
     void setDisabledPlugins(const QSet<QString> &disabled);
     void addDisabledPlugins(const QString &disabled);
 
-    QSet<QString> extraPlugins() const;
+    const QSet<QString>& extraPlugins() const;
     void setExtraPlugins(const QSet<QString> &extraPlugins);
     void addExtraPlugins(const QString &extraPlugin);
 
@@ -66,11 +66,11 @@ public:
 
     bool isValid();
 
-    QSet<QString> extraData() const;
+    const QSet<QString>& extraData() const;
     void setExtraData(const QSet<QString> &extraFiles);
     void addExtraData(const QString &extraFile);
 
-    QSet<QString> translation() const;
+    const QSet<QString>& translation() const;
     void setTranslation(const QSet<QString> &tr);
     void addTranslation(const QString &tr);