Default; provides high compression and fast decompression for most data.
To access the raw scenery data, you must extract the .7z archive. This can be done by right-clicking the file and selecting "Extract" from the 7-Zip context menu. DSF.7z
When putting together a .7z archive for DSF data, you might encounter several compression methods within the Add to Archive dialog: Best Use Case When putting together a
When creating new scenery, developers use DSFTool to compile text files back into the DSF format. How to Work with DSF
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
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. :
: For advanced terrain editing, users often import the extracted .raw files into software like GRASS GIS to manipulate binary raster data. Creation & Re-compression :