'How to fix the "Access to the Path Denied" issue on C# Winform?

I have made a program to modify a file, it works well when I run it regularly:

string modifiedFile = tmpPath + "\\Ext\\out.dat";
    FileStream writeStream = File.OpenWrite(modifiedFile);
    byte[] newData = new byte[2];
    newData[0] = 0x4B;
    newData[1] = 0x4B;
    writeStream.Seek(0, SeekOrigin.Begin);
    writeStream.Write(newData, 0, newData.Length);
    writeStream.Close();

But if I run it from the Email client, which has an email with the attached file, when I click on the attached file (the format has associated to the program), the program runs but throws an error:

Access to the path 'C:\Users\admin\AppData\Local\Temp\Ext\out.dat' is denied

I checked the folder "C:\Users\admin\AppData\Local\Temp\Ext" and the out.dat file is there. What should I do to resolve this? It seems the system doesn't allow me to modify the file?

c++sharpwinformsaccess-denied


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