"const type" can't be an int

Just started with C++, no programming experience apart from working with mSL.
My idea is to have user input select a file which will read the questions in their preferred language. But I can't use "File = "File.txt";" on an int, what should I use?

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//Assignment 1 by Nillen

#include <iostream>
#include <fstream> 
using namespace std;

int main()
{ //Main opening bracket
	int tries, highest, lowest, file; //Create the variables
	lowest = 1; //Starting value of lowest guess
	highest = 100; //Starting value of max guess
	tries = 0; //To increase once per turn

	cout << "Which language do you prefer? \nVilket språk föredrar du? \nどのような言語あなたが好きですか\n";
	cout << "1: English\n";
	cout << "2: Svenska\n"; 
	cout << "3: 日本語\n"; 

	while(true) 
	{ //Infinite while opening bracket
		char LangPref; //User's choice
		cin >> LangPref;  

		if (LangPref == 1)
		{
			file = "english.txt";
			break;
		}
		else if (LangPref == 2) 
		{
			file = "swedish.txt";
			break;
		}
		else if (LangPref == 3) 
		{
			file = "japanese.txt";
			break;
		}
		else 
		{
			cout << "Error: " << LangPref << "is not valid.";
		}
	} //Infinite while closing bracket

	cin.get();
	return 0;
} //Main closing bracket 


I'm well aware that letters like åäö can't be written like that, I'll fix it later.
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