The .tools file is not intended to be edited in a text editor. Sheetcam has a robust UI to define and edit tools. If you want to edit tools en mass, then first use/try menu Tools / ‘Tool table’. If that does not meet your needs, then use File / ‘Import/Export toolset’. You can choose to export as a .csv file and edit that with a spreadsheet pgm.
see also Toolset primer, tips, and tricks