重新安装UE4跟VS后突然发现之前的UE4原先的项目找不到了，然后用UE4打开就提示“该文件没有与之关联的程序来执行该操作，请先安装一个程序。”

发现右键 .uproject 的菜单栏选项不见了，折腾了一下弄回来了，方法如下：

删除注册表

1. ctrl+r 输入 regegit 调出注册表
2. 删除 HKEY_CLASSES_ROOT 下的 .uproject

新建一个文本文档，然后改名为  UnrealProjectMenuRegistration.cmd，脚本源码在下面

:: UnrealProjectMenuRegistration.cmd
::
:: This batch file will try to find where the Unreal Engine is installed, then update your registry
:: to register the Unreal Project File type (and its right click menu for things such as generating
:: Visual Studio project files, and launching)
::
:: Run as an Administrator, as it's required for writing to HKLM.
::
:: Author: David Moore <david@sadrobot.co.nz>

@ECHO OFF

echo.
echo Locating where Unreal Engine is installed by checking the Windows registry...

FOR /F "tokens=2*" %%A IN ('reg query "HKLM\SOFTWARE\EpicGames\Unreal Engine" /v "INSTALLDIR"') DO (
SET "UnrealEngineDir=%%B"
)
IF "%UnrealEngineDir%"=="" GOTO CannotFindUnrealEngine

echo.
echo Using Unreal Engine directory: %UnrealEngineDir%

set LauncherPath=%UnrealEngineDir%Launcher\Engine\Binaries\Win64\UnrealVersionSelector.exe

echo.
echo Adding registry keys for the Unreal Project right click menu...

:: HKLM\SOFTWARE\Classes\.uproject
reg ADD "HKLM\Software\Classes\.uproject" /ve /d Unreal.ProjectFile /f
IF ERRORLEVEL 1 (
echo Couldn't write to registry. Did you forget to run this batch file as an administrator?
goto TheEnd
)

:: HKLM\SOFTWARE\Classes\Unreal.ProjectFile
reg ADD "HKLM\Software\Classes\Unreal.ProjectFile" /ve /d "Unreal Engine Project File" /f

:: HKLM\SOFTWARE\Classes\Unreal.ProjectFile\DefaultIcon
reg ADD "HKLM\Software\Classes\Unreal.ProjectFile\DefaultIcon" /ve /d "\"%LauncherPath%\"" /f

:: HKLM\SOFTWARE\Classes\Unreal.ProjectFile\shell\open
reg ADD "HKLM\Software\Classes\Unreal.ProjectFile\shell\open" /ve /d "Open" /f
reg ADD "HKLM\Software\Classes\Unreal.ProjectFile\shell\open\command" /ve /d "\"%LauncherPath%\" /editor \"%%1\"" /f

:: HKLM\SOFTWARE\Classes\Unreal.ProjectFile\shell\run
reg ADD "HKLM\Software\Classes\Unreal.ProjectFile\shell\run" /ve /d "Launch game" /f
reg ADD "HKLM\Software\Classes\Unreal.ProjectFile\shell\run" /v Icon /t REG_SZ /d "\"%LauncherPath%\"" /f
reg ADD "HKLM\Software\Classes\Unreal.ProjectFile\shell\run\command" /ve /d "\"%LauncherPath%\" /game \"%%1\"" /f

:: HKLM\SOFTWARE\Classes\Unreal.ProjectFile\shell\rungenproj
reg ADD "HKLM\Software\Classes\Unreal.ProjectFile\shell\rungenproj" /ve /d "Generate Visual Studio project files" /f
reg ADD "HKLM\Software\Classes\Unreal.ProjectFile\shell\rungenproj" /v Icon /t REG_SZ /d "\"%LauncherPath%\"" /f
reg ADD "HKLM\Software\Classes\Unreal.ProjectFile\shell\rungenproj\command" /ve /d "\"%LauncherPath%\" /projectfiles \"%%1\"" /f

:: HKLM\SOFTWARE\Classes\Unreal.ProjectFile\shell\switchversion
reg ADD "HKLM\Software\Classes\Unreal.ProjectFile\shell\switchversion" /ve /d "Switch Unreal Engine version..." /f
reg ADD "HKLM\Software\Classes\Unreal.ProjectFile\shell\switchversion" /v Icon /t REG_SZ /d "\"%LauncherPath%\"" /f
reg ADD "HKLM\Software\Classes\Unreal.ProjectFile\shell\switchversion\command" /ve /d "\"%LauncherPath%\" /switchversion \"%%1\"" /f

:Done
echo.
echo Done.
echo.
goto TheEnd

:CannotFindUnrealEngine
echo.
echo DOH! Can't find the Unreal Engine.
echo.
goto TheEnd

:TheEnd
pause

修改脚本

注释掉下面这一段代码

FOR /F "tokens=2*" %%A IN ('reg query "HKLM\SOFTWARE\EpicGames\Unreal Engine" /v "INSTALLDIR"') DO (
SET "UnrealEngineDir=%%B"
)
在注释的代码后加入一行，直接设置 启动器路径（C:\Program Files (x86)\Epic Games\，如果是安装选择的其它路径请自行选择）

SET UnrealEngineDir=C:\Program Files (x86)\Epic Games\ 

1. 右键管理员权限运行该脚本

2. done，项目文件 .uproject 的右键菜单栏选项 回来了            

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