恢复系统公文包方法如下：
1、从其他电脑找到 syncapp.exe synceng.dll syncui.dll 三个文件复制到Windows\system32文件夹下。
2、用记事本文件，制作一个reg注册表文件，导入注册表。
3，运行一次syncapp.exe，就ok了。
注册表文件内容如下：
[table][tr][td]Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\.bfc]
@="Briefcase"[HKEY_CLASSES_ROOT\.bfc\ShellNew]
"Command"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,\
74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,\
00,75,00,6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,\
25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,\
00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,79,00,6e,00,\
63,00,75,00,69,00,2e,00,64,00,6c,00,6c,00,2c,00,42,00,72,00,69,00,65,00,66,\
00,63,00,61,00,73,00,65,00,5f,00,43,00,72,00,65,00,61,00,74,00,65,00,20,00,\
25,00,32,00,21,00,64,00,21,00,20,00,25,00,31,00,00,00[HKEY_CLASSES_ROOT\.bfc\ShellNew\Config]
"NoExtension"=""
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.bfc]
@="Briefcase"[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.bfc\ShellNew]
"Command"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,\
74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,\
00,75,00,6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,\
25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,\
00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,79,00,6e,00,\
63,00,75,00,69,00,2e,00,64,00,6c,00,6c,00,2c,00,42,00,72,00,69,00,65,00,66,\
00,63,00,61,00,73,00,65,00,5f,00,43,00,72,00,65,00,61,00,74,00,65,00,20,00,\
25,00,32,00,21,00,64,00,21,00,20,00,25,00,31,00,00,00[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.bfc\ShellNew\Config]
"NoExtension"=""[HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers\BriefcaseMenu]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"[HKEY_CLASSES_ROOT\*\shellex\PropertySheetHandlers\BriefcasePage]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"[HKEY_CLASSES_ROOT\Briefcase]
@="公文包"
"FriendlyTypeName"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,\
00,6f,00,6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,\
32,00,5c,00,53,00,48,00,45,00,4c,00,4c,00,33,00,32,00,2e,00,64,00,6c,00,6c,\
00,2c,00,2d,00,32,00,32,00,39,00,37,00,38,00,00,00[HKEY_CLASSES_ROOT\Briefcase\CLSID]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"[HKEY_CLASSES_ROOT\Briefcase\DefaultIcon]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,79,00,\
6e,00,63,00,75,00,69,00,2e,00,64,00,6c,00,6c,00,2c,00,30,00,00,00[HKEY_CLASSES_ROOT\Briefcase\shell][HKEY_CLASSES_ROOT\Briefcase\shell\open][HKEY_CLASSES_ROOT\Briefcase\shell\open\command]
@="explorer.exe %1"[HKEY_CLASSES_ROOT\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}]
@="公文包"
"FriendlyTypeName"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,\
00,6f,00,6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,\
32,00,5c,00,53,00,48,00,45,00,4c,00,4c,00,33,00,32,00,2e,00,64,00,6c,00,6c,\
00,2c,00,2d,00,32,00,32,00,39,00,37,00,38,00,00,00
"InfoTip"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,\
6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,\
00,53,00,48,00,45,00,4c,00,4c,00,33,00,32,00,2e,00,64,00,6c,00,6c,00,2c,00,\
2d,00,32,00,32,00,39,00,31,00,37,00,00,00
"LocalizedString"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,\
6f,00,6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,\
00,5c,00,53,00,48,00,45,00,4c,00,4c,00,33,00,32,00,2e,00,64,00,6c,00,6c,00,\
2c,00,2d,00,32,00,32,00,39,00,37,00,38,00,00,00[HKEY_CLASSES_ROOT\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}\DefaultIcon]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,79,00,\
6e,00,63,00,75,00,69,00,2e,00,64,00,6c,00,6c,00,2c,00,30,00,00,00[HKEY_CLASSES_ROOT\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}\InProcServer32]
@="syncui.dll"
"ThreadingModel"="Apartment"[HKEY_CLASSES_ROOT\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}\shellex][HKEY_CLASSES_ROOT\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}\shellex\PropertySheetHandlers][HKEY_CLASSES_ROOT\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}\shellex\PropertySheetHandlers\{1F2E5C40-9550-11CE-99D2-00AA006E086C}][HKEY_CLASSES_ROOT\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}\ShellFolder]
"Attributes"=dword:70000136
[HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers\BriefcaseMenu]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"[HKEY_CLASSES_ROOT\Folder\shellex\PropertySheetHandlers\BriefcasePage]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\*\shellex\ContextMenuHandlers\BriefcaseMenu]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\*\shellex\PropertySheetHandlers\BriefcasePage]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Briefcase]
@="公文包"
"FriendlyTypeName"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,\
00,6f,00,6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,\
32,00,5c,00,53,00,48,00,45,00,4c,00,4c,00,33,00,32,00,2e,00,64,00,6c,00,6c,\
00,2c,00,2d,00,32,00,32,00,39,00,37,00,38,00,00,00[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Briefcase\CLSID]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Briefcase\DefaultIcon]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,79,00,\
6e,00,63,00,75,00,69,00,2e,00,64,00,6c,00,6c,00,2c,00,30,00,00,00[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Briefcase\shell][HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Briefcase\shell\open][HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Briefcase\shell\open\command]
@="explorer.exe %1"[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}]
@="公文包"
"FriendlyTypeName"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,\
00,6f,00,6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,\
32,00,5c,00,53,00,48,00,45,00,4c,00,4c,00,33,00,32,00,2e,00,64,00,6c,00,6c,\
00,2c,00,2d,00,32,00,32,00,39,00,37,00,38,00,00,00
"InfoTip"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,\
6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,\
00,53,00,48,00,45,00,4c,00,4c,00,33,00,32,00,2e,00,64,00,6c,00,6c,00,2c,00,\
2d,00,32,00,32,00,39,00,31,00,37,00,00,00
"LocalizedString"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,\
6f,00,6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,\
00,5c,00,53,00,48,00,45,00,4c,00,4c,00,33,00,32,00,2e,00,64,00,6c,00,6c,00,\
2c,00,2d,00,32,00,32,00,39,00,37,00,38,00,00,00[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}\DefaultIcon]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,79,00,\
6e,00,63,00,75,00,69,00,2e,00,64,00,6c,00,6c,00,2c,00,30,00,00,00[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}\InProcServer32]
@="syncui.dll"
"ThreadingModel"="Apartment"[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}\shellex][HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}\shellex\PropertySheetHandlers][HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}\shellex\PropertySheetHandlers\{1F2E5C40-9550-11CE-99D2-00AA006E086C}][HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{85BBD920-42A0-1069-A2E4-08002B30309D}\ShellFolder]
"Attributes"=dword:70000136[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shellex\ContextMenuHandlers\BriefcaseMenu]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shellex\PropertySheetHandlers\BriefcasePage]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{85BBD920-42A0-1069-A2E4-08002B30309D}]
"Compatibility Flags"=dword:00000400[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved]
"{85BBD920-42A0-1069-A2E4-08002B30309D}"="公文包"[/td][/tr][/table
本部分内容设定了隐藏，需要回复后才能看到
