runtime: System.IO.Compression handles extended characters incorrectly

This issue has been moved from a ticket on Developer Community.

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[severity:It’s more difficult to complete my work] create a text file name “tämä.txt” send to compressed folder Extracting this file it is read by library as “t„m„.txt”

Windows explorer expands the zip fine, as other compression software’s

using System.IO;
using System.IO.Compression;

namespace ZIPtest
{
    class Program
    {
        static void Main(string[] args)
        {
            string zipFile = @"C:\temp\tämä.zip";

using (ZipArchive paketti = ZipFile.OpenRead(zipFile))
            {
                foreach (ZipArchiveEntry entry in paketti. Entries)
                {
                    string nimi = Path.Combine(@"c:\temp", entry. Name);
                    entry. ExtractToFile(nimi);
                }

}
        }
    }
}

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Original Comments

Feedback Bot on 9/20/2020, 11:00 PM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

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Original Solutions

Tarek Mahmoud Sayed [MSFT] solved on 9/30/2020, 01:44 PM, 0 votes:

Thanks for sending the issue. I have tried it the same thing and I was not able to reproduce the issue. My guess here is the problem is not really the ZipArchiveEntry.Name content but it could be the Visual Studio locals Window displaying the string differently and this can be depending on the configuration of your machine. Usually I am seeing this maybe depending on the default codepage on your system.

Here is the code I tried:

        using (ZipArchive paketti = ZipFile.OpenRead(@"F:\temp\release.zip"))
        {
            foreach (ZipArchiveEntry entry in paketti.Entries)
            {
                Console.WriteLine($"{entry.Name} ... {DumpString(entry.Name)}");
            }
        }

And this printed the output:

  tämä.txt ... \u0074\u00e4\u006d\u00e4\u002e\u0074\u0078\u0074

which is correct.

I suggest you can try the same either manually printing the characters ordinal values and check your system configuration like default locale and codepage in the system.

on 10/8/2020, 05:05 AM:

(private comment, text removed)

Tarek Mahmoud Sayed [MSFT] on 10/8/2020, 10:10 AM:

Thanks for your reply. Unfortunately I cannot reach the files that you have attached. Could you please try to upload them again and let me know.

Also, please attach the code that you used to create the zip file again to see how did you include the file tämä.txt too.

on 10/9/2020, 02:29 AM:

(private comment, text removed)

Tarek Mahmoud Sayed [MSFT] on 10/9/2020, 11:01 AM:

Thanks for the details. I'll take a look.