Inserting path to open file

Question

Here is my code
#include <string>
#include <fstream>
using namespace std;
string Path = "D:\\DevPrograms\\Test"; //This a the folder containing a test.txt file
int main (){
ofstream File;
File.open ("What should I enter here to use the Path var above, and then add file name 'test.txt' to open it")
}

Answer 1

That is sort of what I have currently.
path = "D:\\ DevPrograms\\Test\\test.txt"
and it works The problem is you have to have a var for each file to define a certain path. Thus is there a way to select a folder with a bunch of files in it, and then select a certain file when you go to open it.
For example:
Path = D:\\...
file1.open ((Path+"Test1.txt"))
file2.open ((Path+"Test2.txt"))
Edit: I figured it out.
string Path = D:\\DevPrograms\\Test;
int main ()
{
fstream File1;
fstream File2;
File1.open((Path + "\\Test1.txt"))
File2.open((Path + "\\Test2.txt"))
}

Answer 2

Try File.open("D:\\DevPrograms\\Test.txt")