System administrators often extract these archives using tools like 7-Zip to "slipstream" (integrate) the Service Pack directly into an OS installation image. How to Handle the File
Archives for older systems like Windows NT 4.0 , Windows 2000 , or Windows 7 often use the .7z extension to store original Service Pack installers. SP1.7z
Heavyweight applications like SolidWorks 2022 or CircuitMaker 2000 distribute SP1 updates in .7z format to reduce download size. SP1.7z
How to Download and Install Service Pack 1 for Windows 7 (Tutorial) SP1.7z