[版主] 以下節自 Microsoft Knowledge
REGEDIT May Not Be Able to Import Registry with Large Keys
Article ID: Q132064
Creation Date: 27-JUN-1995
Revision Date: 01-DEC-1995
The information in this article applies to: Microsoft Windows 95
IMPORTANT: This article contains information about editing the registry.
Before you edit the registry, you should first make a backup copy of the
registry files (System.dat and User.dat). Both are hidden files in the
When you try to import the registry using Registry Editor (Regedit.exe) in
real mode, you may receive either of the following error messages: Unable to
open registry (14) - System.dat Error accessing the registry: The file may
not be complete.
The real-mode stub of Regedit.exe has the ability to export, import, and
create registry files. Regedit.exe uses the internal real-mode registry
library to accomplish these tasks. The real-mode code in this library has
certain problems with large registry files.
For example, if there are many applications installed, HKEY_CLASSES_ROOT may
be quite large. If one of the structures in the System.dat file takes up too
much space in conventional memory, the registry cannot be accessed.
To work around this problem, use Registry Editor in protected mode.
Microsoft has confirmed this to be a problem in Microsoft Windows 95. We are
researching this problem and will post new information here in the Microsoft
Knowledge Base as it becomes available.