Use a modern tool like 7-Zip to extract the first file, which automatically joins all parts.
Standard consensus among enthusiasts is that NT 4.0 is "seriously bugged" without Service Pack 6a , which is considered essential for modern stability and larger drive support. Compatibility Gaps: Windows-NT-4.0-drivers.7z.001
“NT 4.0, with the right hardware, is completely rock solid. While it not supporting PnP can be a pain, it's also its biggest benefit.” VOGONS · 1 year ago Use a modern tool like 7-Zip to extract
Expect to find folders for specific hardware (Video, LAN, SCSI). You will likely need to point the "Add Hardware" wizard to the specific .inf files within these folders. with the right hardware