a "?" before the string

I wanna use string to input a path of file. Code Sample:

char** argv;
char* mytarget[2]={ (char*)"‪D:\\testlas\\BigOne.pcd",(char*)"‪‪D:\\testlas\\SmallOne.pcd" };
argv = mytarget;
for(int i=0;i<2;i++)
{
   std::cout << "m.name: " << argv[i] <<std::endl;
}

However, the cout outputs:
m.name: ?‪D:\testlas\BigOne.pcd m.name: ?‪D:\testlas\SmallOne.pcd

Why there is a "?" before the string? I use VS2017 c++11.

Then I create a new program and input the code:

#include<iostream>
#include<string>
using namespace std;
int main{

    std::string test = "‪abc789";
    cout << test << endl;
    return; 
}

There it also outputs "?abc789". enter image description here enter image description here