Dotnetzip The Compressed Zipped Folder Is Invalid

I'm trying to create a zip file that contains one or more files.I'm using the .NET framework 4.5 and more specifically System.IO.Compression namespace.The objective is to allow a user to download a zip file through a ASP.NET MVC application.The zip file is being generated and sent to the client but when I try to open it by doing double click on it I get the following error:Windows cannot open the folder.The compressed (zipped) folder ... is invalid.Here's my code:

Following his hint, I noticed that I have a bunch of folders with a bullet in the name (option-8 on the Mac keyboard). Removed all those folders, re-zipped and presto - the .zip file works without issue on Windows.

So, apparently, using characters that are illegal in Windows in the filenames contained in the zip-file will cause Windows to report the "the compressed (zipped) file XYZXYZ is invalid" error with opening the .zip file.

As noted in the list of requirements above, your source bundle must be compressed without a parent folder, so that its decompressed structure does not include an extra top-level directory. In this example, no myapp folder should be created when the files are decompressed (or, at the command line, no myapp segment should be added to the file paths).

I am generating a zip file using System.IO.Compression.ZipFile.CreateFromDirectory method and it works without any problem. Then, I go and double click on such a compressed folder and I get the following error message:

Step 1: First, open the File Explorer, then navigate the folder which contains the ZIP file. Step 2: Now, make double-click on your zipped folder after doing so you can see your archive/documents. Step 3: Choose the files that you need to extract, and click on Cut. Step 4: After that, navigate to the place where you want to keep your unzipped file. And paste it at the place, This PC >> Desktop >> Unzipped folder. Step 5: At this time, make right-click and choose the Paste. Here you can see the unzipped file which can be opened & modified.

1. Just open the WinZip & go to folder where your zipped files are located. 2. Then, make a long press on the folder to choose the files and get menus at the bottom. 3. Now, make a tap on option unzip to simply unzip your Zipped folder or file.

private void buttonCreateSelfExtract_Click(object sender, EventArgs e){ try { //Add a folder to the zip file. //Include subfolders and preserve paths. archive1.IncludeSubs = true; archive1.PreservePath = true; archive1.Add("c:\\MyFiles\\*"); //Set the self-extract parameters. archive1.SelfExtractConfiguration = new SelfExtractConfiguration(); archive1.SelfExtractConfiguration.CodePage = archive1.Encoding.CodePage; archive1.SelfExtractConfiguration.Caption = "My Self-Extracting File"; archive1.SelfExtractConfiguration.Behavior = SelfExtractBehavior.UserInteractive; //No extracted file opened after archive is unzipped. archive1.SelfExtractConfiguration.FileToExecute = ""; //Default overwrite behavior (can be changed by user). archive1.SelfExtractConfiguration.Overwrite = Overwrite.Always; archive1.SelfExtractConfiguration.EnableOverwrite = true; //Paths are preserved (cannot be changed by user). archive1.SelfExtractConfiguration.PreservePath = true; archive1.SelfExtractConfiguration.EnablePreservePath = false; //Path to archive to (can be changed by user). archive1.SelfExtractConfiguration.Path = "c:\\YourFiles"; archive1.SelfExtractConfiguration.EnablePath = true; //Create the zip file. archive1.Zip("c:\\MyArchive\\mySelfExtractingFile.exe"); } catch (Exception ex) { //Display message if operation encounters an error. textWarnings.AppendText("Error: " + ex.Message + Environment.NewLine); }}

Although zipped (compressed) files are popular and convenient, they are still susceptible to corruption that causes file error. When you open or extract files from 7z file and a " headers error" message prompts, you may be bothered and not know what to do. In this article, we will explore possible causes of such problem, easy solutions and steps to fix 7-Zip headers error, and how to recover lost 7-Zip files.

When I wrote Today is "Support Your Favorite Small Software Vendor Day", I made a commitment to spend at least $20 per month supporting my fellow independent software developers. WinRAR has become increasingly essential to my toolkit over the last year, so this month, I'm buying a WinRAR license.Sure, ZIP support is built into most operating systems, but the support is rudimentary at best. I particularly dislike the limited "compressed folder wizard" I get by default in XP and Vista. In contrast, WinRAR is full-featured, powerful, and integrates seamlessly with the shell. There's a reason WinRAR won the best archive tool roundup at DonationCoder. And WinRAR is very much a living, breathing piece of software. It's frequently updated with neat little feature bumps and useful additions; two I noticed over the last year were dual-core support and real-time stats while compressing, such as estimated compression ratio and predicted completion time.WinRAR fully supports creating and extracting ZIP archives, so choosing WinRAR doesn't mean you'll be forced into using the RAR compression format. But you should use it, because RAR, as a compression format, clobbers ZIP. It produces much smaller archives in roughly the same time. If you're worried the person on the receiving end of the archive won't have a RAR client, you can create a self-extracting executable archive (or SFX) at a minimal cost of about 60 KB additional filesize.RAR also supports solid archives, so it can exploit intra-file redundancies. ZIP does not. This is a big deal, because it can result in a substantially smaller archive when you're compressing a lot of files. When I compressed all the C# code snippets, the difference was enormous:ZIP229 KBRAR73 KBBut even in an apples-to-apples comparison, RAR offers some of the very best "bang for the byte" of all compression algorithms. Consider this recent, comprehensive multiple file compression benchmark. The author measured both compression size and compression time to produce an efficiency metric:The most efficient (read: useful) program is calculated by multiplying the compression time (in seconds) it took to produce the archive with the power of the archive size divided by the lowest measured archive size.2 ^ (((Size/SmallestSize)) - 1) / 0.1) * ArchiveTimeThe lower the score, the better. The basic idea is a compressor X has the same efficiency as compressor Y if X can compress twice as fast as Y and resulting archive size of X is 10% larger than size of Y.

ZIP is an archive file format that supports lossless data compression. A .ZIP file may contain one or more files or folders that may have been compressed. The .ZIP file format permits a number of compression algorithms. The format was originally created in 1989 by Phil Katz, and was first implemented in PKWARE, Inc.'s PKZIP utility,[2] as a replacement for the previous ARC compression format by Thom Henderson. The .ZIP format is now supported by many software utilities other than PKZIP. Microsoft has included built-in .ZIP support (under the name "compressed folders") in versions of Microsoft Windows since 1998. Apple has included built-in .ZIP support in Mac OS X 10.3 (via BOMArchiveHelper, now Archive Utility) and later. Most free operating systems have built in support for .ZIP in similar manners to Windows and Mac OS X. 2b1af7f3a8