When you apply the hotfix in the following Microsoft Knowledge base article, then update your computer to Windows NT 4.0 Service Pack 4, the Scsiport.sys file is not updated.
Fault Tolerant Systems May Encounter Problems with WinNT SP3
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or
the individual software update. For information on obtaining the
latest service pack, please go to:
For information on obtaining the individual software update, contact Microsoft
Product Support Services. For a complete list of Microsoft Product Support
Services phone numbers and information on support costs, please go to the
following address on the World Wide Web:
Microsoft has confirmed that this is a problem in Windows NT 4.0. This problem was first corrected in Windows NT 4.0 Service Pack 5.