: This indicates that the file is the fourth part of a larger sequence.

: 7-Zip is an open-source file archiver known for high compression ratios using the LZMA and LZMA2 algorithms.

To access the contents of , a user cannot simply open this individual file. Because it is a middle segment of a spanning archive, the following conditions must be met:

When a file is too large for certain storage systems or transfer methods, it is "split" into multiple volumes.