27.7z.007

: The .7z.007 extension indicates the file was "split" during compression to fit specific size limits, such as for email attachments or storage on multiple drives.

The file is the seventh part of a split multi-volume compressed archive created using 7-Zip . Because it is only a segment of a larger file, you cannot view its content in isolation; you must have all preceding and succeeding parts (e.g., .001 through the final part) to successfully extract the full data. Understanding 7z Multi-Volume Files

: Right-click the first file ( 27.7z.001 ) using a tool like 7-Zip.

: Each part is numbered sequentially. Part 1 typically ends in .7z.001 , Part 2 in .7z.002 , and so on.