Most email providers won't let you send a 5GB file, so you might split it into several 25MB parts.
The primary reason for splitting a large archive into numbered parts like .001 , .002 , and .003 is to bypass storage or transfer limits. For example: KR5.7z.001
Right-click specifically on the file ending in .001 . Extract: Select "Extract Here" or "Extract to KR5." Most email providers won't let you send a