remove .curaproject from the extensions and just use .3mf

CURA-5650

plugins/3MFReader/ThreeMFWorkspaceReader.py

@@ -89,7 +89,7 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
             MimeType(
                 name="application/x-curaproject+xml",
                 comment="Cura Project File",
-                suffixes=["curaproject.3mf"]
+                suffixes=["3mf"]
             )
         )
 
@@ -726,8 +726,6 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
             nodes = []
 
         base_file_name = os.path.basename(file_name)
-        if base_file_name.endswith(".curaproject.3mf"):
-            base_file_name = base_file_name[:base_file_name.rfind(".curaproject.3mf")]
         self.setWorkspaceName(base_file_name)
         return nodes
 

plugins/3MFReader/__init__.py

@@ -18,11 +18,7 @@ catalog = i18nCatalog("cura")
 
 
 def getMetaData() -> Dict:
-    # Workaround for osx not supporting double file extensions correctly.
-    if Platform.isOSX():
-        workspace_extension = "3mf"
-    else:
-        workspace_extension = "curaproject.3mf"
+    workspace_extension = "3mf"
 
     metaData = {}
     if "3MFReader.ThreeMFReader" in sys.modules:

plugins/3MFWriter/__init__.py

@@ -15,11 +15,7 @@ from UM.Platform import Platform
 i18n_catalog = i18nCatalog("uranium")
 
 def getMetaData():
-    # Workarround for osx not supporting double file extensions correctly.
-    if Platform.isOSX():
-        workspace_extension = "3mf"
-    else:
-        workspace_extension = "curaproject.3mf"
+    workspace_extension = "3mf"
 
     metaData = {}