Read raw files indenpendent of the file extension

[bernt-matthias]

It seems that raw files can not be processed if they have a different file extension, e.g. https://github.com/compomics/ThermoRawFileParser/issues/180.

Since there are use cases that could benefit from this we are wondering if it is possible to read raw files even if they have a different extension.

[caetera]

I will add a minimal working example. small.raw and small.data are the same binary file, however, the latter cannot be opened by RawFileReaderFactory

using System.Security.Cryptography;
using ThermoFisher.CommonCore.Data;
using ThermoFisher.CommonCore.Data.Business;

namespace TestApp
{
    class TestApp
    {
        static void Main()
        {
            TryOpen("small.raw");
            TryOpen("small.data");
        }

        static void TryOpen(string path)
        {
            Console.WriteLine($"Working on {path}");
            using (var md5 = MD5.Create())
            {
                using var stream = File.OpenRead(path);
                var hash = BitConverter.ToString(md5.ComputeHash(stream)).Replace("-", "");
                Console.WriteLine($"MD5: {hash}");
            }

            using var rawFile = RawFileReaderFactory.ReadFile(path);
            if (rawFile.IsOpen)
            {
                rawFile.SelectMsData();
                Console.WriteLine($"Opened, {rawFile.RunHeaderEx.SpectraCount} spectra in the file");
            }
            else
            {
                Console.WriteLine("Cannot be openned");
            }
        }
    }
}

Output:

Working on small.raw
MD5: 1B12C93735A9EAECD072031B2184D2ED
Opened, 48 spectra in the file
Working on small.data
MD5: 1B12C93735A9EAECD072031B2184D2ED
Cannot be openned