目前是在Beyond Compare 3.1.9版本上试验可行，其他版本上尚未测试。
添加右键菜单步骤：
1.新建为.bat后缀的文本，将下面“添加右键菜单批处理”复制到此文本中。
2.将批处理移动到Beyond Compare 3安装目录。
3.双击批处理开始执行。
4.打开Beyond Compare 3软件，工具->选项->启动，勾选“在资源管理器关联菜单中显示Beyond Compare”。
5.重启电脑。
6.取消右键菜单批处理也需要在Beyond Compare 3安装目录下执行。
添加右键菜单批处理
@ECHO OFF rem 请将此脚本放在BC的目录执行，例如 F:\Software\Beyond Compare REM 将当前路径设为变量 SET BC3PATH=%~DP0 REM 创建用户配置文件，关闭初次启动程序时的设置向导 if exist "%USERPROFILE%\Application Data\Scooter Software\Beyond Compare 3" RD /q /s "%USERPROFILE%\Application Data\Scooter Software\Beyond Compare 3" IF NOT EXIST "%USERPROFILE%\Application Data\Scooter Software\Beyond Compare 3" MD "%USERPROFILE%\Application Data\Scooter Software\Beyond Compare 3" COPY /Y NUL "%USERPROFILE%\Application Data\Scooter Software\Beyond Compare 3\BCState.xml" ( ECHO ^<?xml version="1.0" encoding="UTF-8"?^> ECHO ^<!-- Produced by Beyond Compare 3 from Scooter Software --^> ECHO ^<BCState^> ECHO ^<TBcState^> ECHO ^<FirstStartup Value="False"/^> ECHO ^<FormPosStr Value="110;111;980;737"/^> ECHO ^</TBcState^> ECHO ^</BCState^> ) >> "%USERPROFILE%\Application Data\Scooter Software\Beyond Compare 3\BCState.xml" REM 注册右键 reg add "HKLM\Software\Scooter Software\Beyond Compare 3" /v "ExePath" /t REG_SZ /d "%cd%\BCompare.exe" /f rem reg add "HKLM\Software\Scooter Software\Beyond Compare 3" /v "Version" /t REG_SZ /d "3.1.7.10865" /f reg add "HKCU\Software\Scooter Software\Beyond Compare 3" /v "ExePath" /t REG_SZ /d "%cd%\BCompare.exe" /f rem reg add "HKCU\Software\Scooter Software\Beyond Compare 3" /v "Version" /t REG_SZ /d "3.1.7.10865" /f reg add "HKCR\.bcpkg" /ve /t REG_SZ /d "BeyondCompare.SettingsPackage" /f reg add "HKCR\BeyondCompare.SettingsPackage" /ve /t REG_SZ /d "Beyond Compare Settings Package" /f reg add "HKCR\BeyondCompare.SettingsPackage\DefaultIcon" /ve /t REG_SZ /d "%cd%\BCompare.exe,0" /f reg add "HKCR\BeyondCompare.SettingsPackage\shell\open\command" /ve /t REG_SZ /d "\"%cd%\BCompare.exe\" \"%%1\"" /f reg add "HKCR\.bcss" /ve /t REG_SZ /d "BeyondCompare.Snapshot" /f reg add "HKCR\BeyondCompare.Snapshot" /ve /t REG_SZ /d "Beyond Compare Snapshot" /f reg add "HKCR\BeyondCompare.Snapshot\DefaultIcon" /ve /t REG_SZ /d "%cd%\BCompare.exe,0" /f reg add "HKCR\BeyondCompare.Snapshot\shell\open\command" /ve /t REG_SZ /d "\"%cd%\BCompare.exe\" \"%%1\"" /f reg add "HKLM\System\CurrentControlSet\Services\EventLog\Application\Beyond Compare 3" /v "EventMessageFile" /t REG_SZ /d "%cd%\BCompare.exe" /f reg add "HKLM\System\CurrentControlSet\Services\EventLog\Application\Beyond Compare 3" /v "TypesSupported" /t REG_DWORD /d 7 /f
取消右键菜单批处理
reg delete "HKLM\Software\Scooter Software" /f reg delete "HKCU\Software\Scooter Software" /f reg delete "HKCR\.bcpkg" /f reg delete "HKCR\BeyondCompare.SettingsPackage" /f reg delete "HKCR\.bcss" /ve /t REG_SZ /d "BeyondCompare.Snapshot" /f reg delete "HKCR\BeyondCompare.Snapshot" /f reg delete "HKLM\System\CurrentControlSet\Services\EventLog\Application\Beyond Compare 3" /f pause
参考链接：https://www.cnblogs.com/mq0036/p/3902249.html