Ds_143_m.7z.001

: This usually means a part is missing or the download was corrupted.

: Right-click on the first file, DS_143_M.7z.001 . DS_143_M.7z.001

: If you only have the .001 file and the archive was originally split into multiple volumes, it cannot be opened. Reliable Tools Windows : The official 7-Zip tool is free and open-source. : This usually means a part is missing