在安装目录下创建文件right_menu.inf  ，写入以下信息：

[Version]
Signature="$Windows NT$"
[DefaultInstall]
AddReg=SublimeText3
[SublimeText3]
hkcr,"*\shell\SublimeText3",,,"Open with sublime text 3"
hkcr,"*\shell\SublimeText3\command",,,"""%1%sublime_text.exe"" ""%%1"" %%*"
hkcr,"DirectoryshellSublimeText3",,,"Open with sublime text 3"
hkcr,"*\shell\SublimeText3","Icon",0x20000,"%1%sublime_text.exe, 0"
hkcr,"DirectoryshellSublimeText3command",,,"""%1%sublime_text.exe"" ""%%1"""

保存，退出，然后右键-安装，搞定。