When putting together a .7z archive for DSF data, you might encounter several compression methods within the Add to Archive dialog: Best Use Case
If a .dsf file is itself a 7z-compressed archive (sometimes indicated by a .dsf.7z extension or simply renamed), you can rename it back to .7z to extract it. : DSF.7z
A high-compression file format. Using 7-Zip on DSF files can significantly reduce their size, which is critical for large scenery packages. How to Work with DSF.7z Files When putting together a
A standard method based on the BWT algorithm, offering a balance of speed and ratio. DSF.7z