The columns you get
- If every placemark is a single point, the table starts with
latitudeandlongitudecolumns. - If there are lines or polygons, every row gets one
wktcolumn instead, with points written asPOINT. A MultiGeometry that mixes types is kept as oneGEOMETRYCOLLECTIONvalue. - After the coordinates come
name,description, every ExtendedData value and afoldercolumn with the placemark's folder path.
Placemarks without coordinates keep their row, with the coordinate cells left empty.
Ready for spreadsheets
The file is UTF-8 with a byte order mark, so Excel shows accented and non-Latin text correctly. Cells that begin with =, +, - or @ get a leading apostrophe so a spreadsheet will not run them as formulas; plain negative numbers are left as they are. Descriptions written in HTML are kept as text.
What is dropped
CSV has no place for styles, so colors and line widths are left out, and altitude is removed. The conversion report counts the placemarks that had styling, and mentions altitude only when a height was not zero.