该文件常见出现的位置

版本	位置
10.0.2531.0((Katmai_PCU_Main).	\ProgramFiles\MicrosoftSQLServer\100\SetupBootstrap\UpdateCache\KB968369\ServicePack\x86\setup\2052\windows\gac\zh-chs
10.0.2531.0((Katmai_PCU_Main).	\ProgramFiles\MicrosoftSQLServer\100\SetupBootstrap\UpdateCache\KB968369\ServicePack\x64\setup\2052\windows\gac_32\zh-chs
10.0.5500.0((Katmai_PCU_Main).	\ProgramFiles\MicrosoftSQLServer\100\SetupBootstrap\UpdateCache\KB2546951\ServicePack\x64\setup\2052\windows\gac_32\zh-chs
10.0.2531.0((Katmai_PCU_Main).	\ProgramFiles\MicrosoftSQLServer\100\SetupBootstrap\UpdateCache\KB2285068\ServicePack\x86\setup\2052\windows\gac\zh-chs
10.0.5500.0((Katmai_PCU_Main).	\ProgramFiles\MicrosoftSQLServer\100\SetupBootstrap\UpdateCache\KB2546951\ServicePack\x86\setup\2052\windows\gac\zh-chs
10.0.2531.0((Katmai_PCU_Main).	\ProgramFiles\MicrosoftSQLServer\100\SetupBootstrap\UpdateCache\KB2285068\ServicePack\x64\setup\2052\windows\gac_32\zh-chs
10.50.1600.1((KJ_RTM).100402-1	\ProgramFiles\MicrosoftSQLServer\100\SetupBootstrap\UpdateCache\KB2528583\ServicePack\2052_chs_lp\x86\setup\sqlsupport_msi\windows\gac\zh-chs
10.50.1600.1((KJ_RTM).100402-1	\ProgramFiles\MicrosoftSQLServer\100\SetupBootstrap\UpdateCache\KB2528583\ServicePack\2052_chs_lp\x64\setup\sqlsupport_msi\windows\gac_32\zh-chs
10.0.2531.0((Katmai_PCU_Main).	\2052_CHS_LP\x64\Setup\sql2008support\windows\gac_32\zh-chs
10.0.2531.0((Katmai_PCU_Main).	\2052_CHS_LP\x64\Setup\sql2008support\windows\gac_32\zh-chs
10.0.2531.0((Katmai_PCU_Main).	\2052_CHS_LP\ia64\Setup\sql2008support\windows\gac_32\zh-chs
10.0.2531.0((Katmai_PCU_Main).	\2052_CHS_LP\x86\Setup\sql2008support\windows\gac\zh-chs
10.0.2531.0((Katmai_PCU_Main).	\2052_CHS_LP\x86\Setup\sql2008support\windows\gac\zh-chs
10.0.2531.0((Katmai_PCU_Main).	\ProgramFiles\MicrosoftSQLServer\100\SetupBootstrap\UpdateCache\KB2494089\GDR\x64\setup\1033\windows\gac_32\zh-chs
10.50.1600.1((KJ_RTM).100402-1	\2052_CHS_LP\x86\Setup\sqlsupport_msi\Windows\Gac\zh-CHS

一、如果您的系统提示“没有找到irwnvu4n.dll”或者“缺少irwnvu4n.dll”等类似错误信息，请把irwnvu4n.dll下载到本机
二、直接拷贝该文件到系统目录里：
　 1、Windows NT/2000系统，则复制到C:\WINNT\System32目录下。
2、Windows XP/Vista/Win7/8系统，则复制到C:\Windows\System32目录下。
三、然后打开“开始-运行-输入regsvr32 irwnvu4n.dll”，回车即可解决错误提示！