inno安装客户端，写注册表url调用客户端

[Registry]
Root: HKCR; SubKey: xxx; ValueData: "xxx"; ValueType: string; Flags: CreateValueIfDoesntExist UninsDeleteKey;
Root: HKCR; SubKey: xxx; ValueName: "URL Protocol"; Flags: CreateValueIfDoesntExist; ValueType: string;
Root: HKCR; SubKey: xxxDefaultIcon; ValueData: "{app}app.exe"; Flags: CreateValueIfDoesntExist; ValueType: string;
Root: HKCR; SubKey: xxxshellopencommand; ValueData: "{app}app.exe"; Flags: CreateValueIfDoesntExist; ValueType: string;

其中xxx为协议名，app.exe为应用程序名，{app}为安装路径
添加完毕之后就可以在浏览器上直接
xxx://其他参数