Cannot open saved zip files extracted from Outlook Mail

Question

Hi Everyone I've created a small C# application which extracts attachments from outlook emails and saves them to a network location. I can open all of the saved files except for compressed files with zip extension. Files with the zip extension can only be opened/extracted via Windows Explorer. If I try to use WinRAR I get the following error: The archive is either in unknown format or damaged. WinZip does not work either. If however I open the email within outlook manually and copy the zip file to my PC I am able to open the zipped file using WinRAR WinZip as well as windows explorer. Part of the code used to save the attachment is shown below. Microsoft.Office.Interop.Outlook.MailItem _mailItem; ... ... _AttachFileName = _mailItem.Attachments[j].FileName; _TempAttachmentFile = Path.Combine(_tempFolder.Path _AttachFileName); _mailItem.Attachments[j].SaveAsFile(_TempAttachmentFile); ... ... Has anyone faced a similar issue with compressed zip files? If so were you able to resolve the issue? Any ideas or help on this will be appreciated. Thanks Navnit

navnit mudaliar · Answer

Hi Everyone I managed to get to the bottom of the issue. The problem I was having wasn't caused by the code I posted earlier. After posting my issue on the forum I had a closer look at what I was doing within my code and found that at a later stage of my application code I was converting the attachment into base64 string for some internal processing. This was eventually getting saved back as a file to the final destination folder. It was during this final saving process I accidently reduced the data by a byte. Code causing the issue: FileStream outFile; .. outFile.Write(binaryData 0 binaryData.Length-1); .. Fixed code: FileStream outFile; .. outFile.Write(binaryData 0 binaryData.Length); .. Apologies for the confusion.