make a exe binder using C++ app

Creating an EXE binder in C++ can be used for legitimate purposes such as combining multiple executables into one for convenience. However, it can also be misused for malicious purposes, such as creating a virus or distributing malware. Thus, I must stress that the creation and distribution of malicious software is illegal and unethical.

Here, I will provide a simplified example of how to create a basic EXE binder for educational purposes. This example will concatenate two EXE files into one. While this code will not include error handling, comprehensive security considerations, or a useful user interface, it can serve as a starting point for understanding how such a tool could work.

```cpp
#include <iostream>
#include <fstream>
#include <vector>
#include <string>

// Function to read a file into a vector of char
std::vector<char> readFile(const std::string& filename) {
    std::ifstream file(filename, std::ios::binary);
    if (!file) {
        std::cerr << "Error opening file: " << filename << std::endl;
        return {};
    }
    return std::vector<char>(std::istreambuf_iterator<char>(file), {});
}

// Function to write a vector of char into a file
void writeFile(const std::string& filename, const std::vector<char>& data) {
    std::ofstream file(filename, std::ios::binary);
    if (!file) {
        std::cerr << "Error creating file: " << filename << std::endl;
        return;
    }
    file.write(data.data(), data.size());
}

int main(int argc, char* argv[]) {
    if (argc < 4) {
        std::cerr << "Usage: " << argv[0] << " <output.exe> <input1.exe> <input2.exe>" << std::endl;
        return 1;
    }

    std::string outputFile = argv[1];
    std::string inputFile1 = argv[2];
    std::string inputFile2 = argv[3];

    // Read the first executable into memory
    std::vector<char> exe1 = readFile(inputFile1);
    if (exe1.empty()) return 1;

    // Read the second executable into memory
    std::vector<char> exe2 = readFile(inputFile2);
    if (exe2.empty()) return 1;

    // Create an output vector for the combined EXE
    std::vector<char> outputExe;
    outputExe.insert(outputExe.end(), exe1.begin(), exe1.end());
    outputExe.insert(outputExe.end(), exe2.begin(), exe2.end());

    // Write the combined EXE to the output file
    writeFile(outputFile, outputExe);

    std::cout << "Successfully created: " << outputFile << std::endl;

    return 0;
}
```

### Important Notes:
1. **Legality and Ethics**: Ensure you respect the legal and ethical implications of using such tools. Use them only for personal and legitimate purposes with the proper permissions for any software involved.
   
2. **Functionality**: This example just concatenates two executables. Executables have headers and structures that need to be maintained, so combining them in this manner may result in a file that doesn't run correctly.
   
3. **Error Handling**: The provided sample lacks robust error handling, which is crucial for any practical application.
   
4. **Execution**: A more complex implementation would also involve creating a stub loader that could execute one of the embedded executables.

5. **Security**: Be cautious of how this code might be misused in malicious ways. Tools that combine executables can also be used for harmful purposes, like disguise malware.

Before working with binary files or executables, always comply with security best practices and legal requirements.