: This extension indicates it is a container file. To view what is inside, you would need to extract it using a tool like 7-Zip or WinZip .
: This is likely a unique identifier, often associated with internal databases, specific scientific data sets, or private backups. ajb06454.7z
You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip. Does 7z compress better than zip? - Microsoft Community Hub : This extension indicates it is a container file