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Register .kc as a recognized file type alongside .FCStd: C++ changes: - Document.cpp: checkFileName() accepts .kc extension - Gui/Document.cpp: Save As and Save Copy dialogs include *.kc - CommandDoc.cpp: Merge document dialog includes *.kc - DlgProjectUtility.cpp: Project utility dialog includes *.kc Python changes: - FreeCADInit.py: register *.kc in import type system - kc_format.py: DocumentObserver that preserves silo/ ZIP entries across saves (caches before save, re-injects after save) - InitGui.py: register kc_format observer on startup Silo integration: - get_cad_file_path() generates .kc paths for new files - find_file_by_part_number() finds both .kc and .FCStd, preferring .kc - search_local_files() lists both .kc and .FCStd files The .kc format is a superset of .FCStd with a silo/ directory containing Kindred platform metadata. See docs/KC_SPECIFICATION.md.