call file from Root folder

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C#

Windows

I've an app that is trying to call a .txt file from the project root. The file is defined as in the config:

<add key="BCReportSpec-Full" value=".\BC_DiffReportFull.txt"/>

but when the process in this method tries to run, I am getting the error can not find file '.\BC_DiffReportFull.txt'

// Call BeyondCompare, pass it the parameters and generate the report
protected void compare(string file1, string file2, string outputFile, string reportParamFile)
{
    if (File.Exists(file1) && File.Exists(file2))
    {
        System.Diagnostics.Process proc = new System.Diagnostics.Process();
        proc.EnableRaisingEvents = false;
        proc.StartInfo.FileName = BCFileSpec;
        proc.StartInfo.Arguments = "@\"" + reportParamFile + "\" \"" + file1 + "\" \"" + file2 + "\" \"" + outputFile + "\" /silent";
        proc.StartInfo.CreateNoWindow = true;
        proc.Start();
        proc.WaitForExit();
        proc.Close();
    }
    else
    {
        ...
    }
    return;
}