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I don't know but it is stupid! lol
Check properties to see what format it is in-odds are you don't have necessary program installed for that format.Make sure it is safe before you open.
well you cant read them so i do not know???????????????????????????????????????????????????????????????????????????????????????????????????????????????
When an end user sends an email from a Windows Exchange or Outlook client, a file attachment called Winmail.dat may be automatically added to the end of the message.
Open the calendar in SharePoint. If you're using SharePoint 2010, select the ribbon tab - Calendar and click the button 'connect to outlook'. If you're using sharepoint 2007. Click the actions menu > connect to outlook.
You can open any attachment just by clicking on it. the attachment could be any type of file. It could be an image, a document or a video.
in processess tab click on the outlook process and clikc 'end process' button.
That would depend on what the attachment was.
You can read an attachment by left clicking on the attachment, or right clicking on the attachment and left clicking on "Open".
no u cant
You don't have to open it.
The cause of non-opening might be file corruption. If it's right you would advise application below. It can help you to open .pdf documents of any version Adobe Acrobat