Hi,

Due to strict security requirements, I need to use the AES feature. My questions are:

a. What other ZIP clients, besides WinZip 9 and 10, will be able to open the resultant ZIP file?

b. Which ZIP format is the resultant ZIP file: 4.5 or 5.2 or others?

Thanks in advance.

a. You will need to verify yourself, but most likely 7-Zip and PKWare, and certainly others.

b. format is 4.5 because of the Zip64 feature.

Thank you. I'm trying out the 45-day trial using the following code snippet:

AbstractFile file = new DiskFile(@"d:\mytest.zip");
if (file.Exists) { file.Delete(); }
ZipArchive archive = new ZipArchive(file);
archive.DefaultEncryptionMethod = EncryptionMethod.WinZipAes;
archive.DefaultEncryptionStrength = 256;
archive.DefaultDecryptionPassword = "This is a trial password";
AbstractFolder source = new DiskFolder(@"d:\temp\small");
source.CopyFilesTo(archive, true, true);

Strangely the resultant ZIP file is not encrypted and can be opened without supplying any password. Is anything missing from the code?

Found the bug.

archive.DefaultDecryptionPassword = "This is a trial password";

should be replaced by 

 archive.DefaultEncryptionPassword = "This is a trial password";