To save projects, there are 2 different options with 3 formats to save projects in.
SAVING PROJECTS DIRECTLY (SAVE)
Save - Saves the project as a Luckode project (.lpr), that opens only with Luckode 9.0+.
Save Legacy - Saves the project as a Luckode legacy project (.luckode), that opens in all versions of Luckode.
Save SB - Saves the project as a Scratch project (.sb), that opens in all versions of Luckode, Scratch 1.3, and Scratch 1.4.
SAVING PROJECTS AS A DIFFERENT FILE (SAVE AS)
Save As - Saves the project as a Luckode project (.lpr), that opens only with Luckode 9.0+.
Save As Legacy - Saves the project as a Luckode legacy project (.luckode), that opens in all versions of Luckode.
Save As SB - Saves the project as a Scratch project (.sb), that opens in all versions of Luckode, Scratch 1.3, and Scratch 1.4.
NOTICE: You can also save the project by clicking on the floppy disk icon, or save as a project format by clicking on the clover, the L icon, or the Scratch Cat head.