Back in 1996, Stuffit introduced DropSegment which worked much like DropStuff (compression aoo) and StuffIt Expander (decompression app). Dropping a StuffIt archive (a single file compressed as .sit file) on DropSegment enabled the user to make a multi-segment, self-joining, self-extracting archive, which was useful for copying huge archives to floppy disks.
Segmenting files has not gone away despite increases to storage, large email attachment, etc.
If you have a number of files that have a .001, .002, .003 in their name they are most likely a segmented file, The following video on Youtube describes segmentin a file in WinRar
Today, multi-rar files are particularly common. RAR is a proprietary archive file format used to compress files, It can also split a file into segments and return them back to their original 1 file state (merge/concatenate). These multi-rar files expand as long as all segments are avilable, usually in the same directory. Here is a video on the subject
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