diff --git a/plugins/3MFReader/ThreeMFWorkspaceReader.py b/plugins/3MFReader/ThreeMFWorkspaceReader.py
index cc47dfca80..90241c6e72 100755
--- a/plugins/3MFReader/ThreeMFWorkspaceReader.py
+++ b/plugins/3MFReader/ThreeMFWorkspaceReader.py
@@ -86,7 +86,7 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
 
         MimeTypeDatabase.addMimeType(
             MimeType(
-                name="application/x-cura-project-file",
+                name="application/x-curaproject+xml",
                 comment="Cura Project File",
                 suffixes=["curaproject.3mf"]
             )
diff --git a/resources/qml/Cura.qml b/resources/qml/Cura.qml
index e8f832a733..5e12d3f1b9 100644
--- a/resources/qml/Cura.qml
+++ b/resources/qml/Cura.qml
@@ -139,13 +139,15 @@ UM.MainWindow
                     text: catalog.i18nc("@title:menu menubar:file","Save &Project...")
                     onTriggered:
                     {
+                        var args = { "filter_by_machine": false, "file_type": "workspace", "preferred_mimetype": "application/x-curaproject+xml" };
                         if(UM.Preferences.getValue("cura/dialog_on_project_save"))
                         {
+                            saveWorkspaceDialog.args = args;
                             saveWorkspaceDialog.open()
                         }
                         else
                         {
-                            UM.OutputDeviceManager.requestWriteToDevice("local_file", PrintInformation.jobName, { "filter_by_machine": false, "file_type": "workspace" })
+                            UM.OutputDeviceManager.requestWriteToDevice("local_file", PrintInformation.jobName, args)
                         }
                     }
                 }
@@ -557,7 +559,8 @@ UM.MainWindow
     WorkspaceSummaryDialog
     {
         id: saveWorkspaceDialog
-        onYes: UM.OutputDeviceManager.requestWriteToDevice("local_file", PrintInformation.jobName, { "filter_by_machine": false, "file_type": "workspace" })
+        property var args
+        onYes: UM.OutputDeviceManager.requestWriteToDevice("local_file", PrintInformation.jobName, args)
     }
 
     Connections