Upgrading SNA 3.0 to 4.0 may cause failure on Mfc42u.dll file

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This article was previously published under Q182882

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SYMPTOMS

When you upgrade Microsoft SNA Server from version 3.0 to version 4.0, you may receive a pop-up message indicating that SNA Server cannot copy the Mfc42u.dll file to the \WINNT\System32 directory. A dialog is then presented with the options to Abort, Retry, or Ignore.

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CAUSE

This message can occur if an application, such as Microsoft Visual C++ 4.2 (or some third-party application that has been written to use its own version of the Mfc42u.dll file), has a lock on this file during the upgrade process.

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