File menu operations:
- New file (Ctrl+N) - reset RAM and registers
- Open (Ctrl+O) - load snapshot (.kr580 or .sav, auto-detected)
- Save (Ctrl+S) - quick save to current file
- Save as (Ctrl+Shift+S) - save to new file
- Import (Ctrl+I) - choose a TXT/XLSX file and a sheet or section when the file provides one
- Export (Ctrl+E) - choose MS Excel or Text file, page or sections, RAM range, columns, registers, and flags, then save data. TXT sections are saved as several named blocks in one file
Legacy format (.sav):
- Open legacy (Ctrl+Alt+O)
- Save legacy (Ctrl+Alt+S)
Unsaved changes trigger a confirmation dialog.