Added .3mf extension to the MimeType

CURA-5367

plugins/3MFReader/ThreeMFReader.py

@@ -15,7 +15,6 @@ from UM.Math.Vector import Vector
 from UM.Mesh.MeshBuilder import MeshBuilder
 from UM.Mesh.MeshReader import MeshReader
 from UM.Scene.GroupDecorator import GroupDecorator
-from UM.MimeTypeDatabase import MimeTypeDatabase, MimeType
 
 from cura.Settings.ExtruderManager import ExtruderManager
 from cura.Scene.CuraSceneNode import CuraSceneNode
@@ -26,15 +25,6 @@ from cura.Machines.QualityManager import getMachineDefinitionIDForQualitySearch
 
 MYPY = False
 
-
-MimeTypeDatabase.addMimeType(
-    MimeType(
-        name = "application/x-cura-project-file",
-        comment = "Cura Project File",
-        suffixes = ["curaproject.3mf"]
-    )
-)
-
 try:
     if not MYPY:
         import xml.etree.cElementTree as ET

plugins/3MFReader/__init__.py

@@ -13,8 +13,24 @@ from . import ThreeMFWorkspaceReader
 
 from UM.i18n import i18nCatalog
 from UM.Platform import Platform
+from UM.MimeTypeDatabase import MimeTypeDatabase, MimeType
 catalog = i18nCatalog("cura")
 
+MimeTypeDatabase.addMimeType(
+    MimeType(
+        name = "application/x-cura-project-file",
+        comment = "Cura Project File",
+        suffixes = ["curaproject.3mf"]
+    )
+)
+MimeTypeDatabase.addMimeType(
+    MimeType(
+        name = "application/x-cura-project-file",
+        comment = "Cura Project File",
+        suffixes = ["3mf"]
+    )
+)
+
 def getMetaData() -> Dict:
     # Workarround for osx not supporting double file extensions correctly.
     if Platform.isOSX():