diff --git a/src/plugins/python/Python.json.in b/src/plugins/python/Python.json.in
index 3e62d146313..98fd52ec8d5 100644
--- a/src/plugins/python/Python.json.in
+++ b/src/plugins/python/Python.json.in
@@ -30,12 +30,16 @@
         \"        <comment>Python module interface file</comment>\",
         \"        <glob pattern=\'*.pyi\'/>\",
         \"    </mime-type>\",
-        \"    <mime-type type=\'text/x-python-project\'>\",
+        \"    <mime-type type=\'text/x-pyqt-project\'>\",
         \"        <sub-class-of type=\'text/x-python\'/>\",
         \"        <comment>Qt Creator Python project file</comment>\",
-        \"        <glob pattern=\'*.pyproject\'/>\",
         \"        <glob pattern=\'*.pyqtc\'/>\",
         \"    </mime-type>\",
+        \"    <mime-type type=\'text/x-python-project\'>\",
+        \"        <sub-class-of type=\'application/json\'/>\",
+        \"        <comment>Qt Creator Python project file</comment>\",
+        \"        <glob pattern=\'*.pyproject\'/>\",
+        \"    </mime-type>\",
         \"</mime-info>\"
     ]
 }
diff --git a/src/plugins/python/pythonplugin.cpp b/src/plugins/python/pythonplugin.cpp
index 4728da37ae5..7eefbc5d4bd 100644
--- a/src/plugins/python/pythonplugin.cpp
+++ b/src/plugins/python/pythonplugin.cpp
@@ -59,6 +59,7 @@ void PythonPlugin::initialize()
     d = new PythonPluginPrivate;
 
     ProjectManager::registerProjectType<PythonProject>(PythonMimeType);
+    ProjectManager::registerProjectType<PythonProject>(PythonMimeTypeLegacy);
     JsonWizardFactory::registerPageFactory(new PythonWizardPageFactory);
 }
 
diff --git a/src/plugins/python/pythonproject.h b/src/plugins/python/pythonproject.h
index 0217a77b615..676e010a015 100644
--- a/src/plugins/python/pythonproject.h
+++ b/src/plugins/python/pythonproject.h
@@ -7,7 +7,8 @@
 
 namespace Python::Internal {
 
-const char PythonMimeType[] = "text/x-python-project"; // ### FIXME
+const char PythonMimeType[] = "text/x-python-project";
+const char PythonMimeTypeLegacy[] = "text/x-pyqt-project";
 const char PythonProjectId[] = "PythonProject";
 const char PythonErrorTaskCategory[] = "Task.Category.Python";