: Use a tool like 7-Zip or WinZip to open only the first file ( Dan04.7z.001 ).
The file is the second part of a multi-volume split archive created with 7-Zip . Dan04.7z.002
: You must have all related parts (e.g., Dan04.7z.001 , Dan04.7z.002 , Dan04.7z.003 , etc.) saved in the same folder . : Use a tool like 7-Zip or WinZip