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Cannot open pdf file in email

I am recieving emails with .dat attachments that I cannot open, however the sender attaches as .pdf file. Why would it be changing?

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This is a known issue with users sending PDF's using Microsoft Outlook. The link below gives instructions on how to change on their end.

Link:
PDF file changed to DAT file on receiving end when using Outlook in...

I also found a solution that might work on your end...This is from a blog post on the Apple forums.

This is a common problem.
I have found a converion web-site www.winmaildat.com, where you upload the problem file, and it is automatically 'deciphered', and the contents can be downloaded in their individual files.

Posted on Jul 10, 2014

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Posted on Jan 02, 2017

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2 Answers

Why are jpg attachments showing up as winmail.dat files on my iPhone?


I haven't seen much directly relating to jpg formats becoming winmail.dat files, but it seems with the new iphone ios7 operating system, many other types of RTF and PDF sorts are coming in as winmail.dat files and who's to blame at the moment might be unknown. Some blame Microsoft while others are isolating it down to the new ios7.

I'll keep looking but this is what i found so far...

Winmail dat attachments

Feb 08, 2015 | Apple iPhone Smartphone

1 Answer

Can't get most of my attachments to appear


With the Web-based Yahoo! Mail service, you can attach to your email message a saved Web page or another document in HyperText Markup Language format.
When you attach an HTML file in this way, Yahoo! Mail won't display the HTML content of the attached file in the email message body.
To view the attachment, you must click the attachment tab above the email message.Yahoo! Mail and HTML
Yahoo! Mail is a Web-based service and it's fully compatible with the coding languages used to design and display Web content, including HTML and XML, Extensible Markup Language.
This means emails sent or received in Rich text or HTML format include clickable hyperlinks, graphics and other Web design elements.
However, Yahoo! handles emails with HTML attachments in a different way to email messages formatted with HTML.

About Yahoo! Mail Attachments
Like most email programs and online services, Yahoo! Mail offers an attachment feature for adding images, video clips, audio files and HTML document to email messages.
Some email programs display the content of the attached file in the email message body, but Yahoo! Mail doesn't provide this feature for any file attachment, whether it's an image, video clip or HTML document.


Viewing Yahoo! Mail Attachments When you attach an HTML document or another file to your Yahoo! Mail message, an "Attachments" button labeled with a "Paperclip" icon appears below the email address fields and above the email message body.
Clicking the "Attachments" button opens a pane containing a list of all files attached to the email. The email sender or recipient can open each attachment to view the files by clicking the file name.

Considerations

When sending a Yahoo! Mail with an attachment, always explain the content of the attachment in the main body of the email message.
A brief explanation will encourage the recipient to click and open the attachment to view the HTML document.
Bear in mind that many email services automatically block HTML attachments because of the security risk of opening HTML files, which can contain viruses, phishing scams or open Web pages with inappropriate content.
If you want to share a favorite Web page with a friend or contact, include a hyperlink to the Web page rather than a saved copy as an HTML attachment.




Oct 17, 2013 | Yahoo Mail

1 Answer

Cannot open my emails


Which email acc.????...
Windows Live Hotmail allows users to view attachments within a Web browser or save them to the system's hard drive.
If Hotmail can't open an attachment, the problem lies with an incompatible file format or Hotmail's automatic blocking service.
You may need new software for opening unfamiliar formats, while blocked files are permanently inaccessible from within Hotmail.
Accessing these files requires action by the sender or forwarding the file to a different email client. Incompatible File Format
Occasionally a sender may attach a file that simply doesn't work with any software you have installed on the system.
Attempting to open the attachment will result in a "Windows cannot open this file" message or similar error display.
Many programs use very specific file formats that don't operate with most other software, such as Photoshop's PSD image files or Microsoft PowerPoint's PPT files.
Ask the sender to convert the file to a more widely compatible format, or install the appropriate software on the system to open the attachment.

Blocked Attachments
Hotmail blocks attachments it believes may contain unsafe or otherwise malicious code.
This includes any and all executable file types, including MSI, EXE, HTML, STC and COM files, along with many others.
Attachments blocked in this way result in a "Windows Live Hotmail has blocked some attachments" message when viewing the email.
While this service does block many real threats to system security, Hotmail may occasionally deny access to an item from a trusted sender.
Unfortunately, these files become permanently inaccessible once blocked by Hotmail, and accessing them requires using a workaround outside the Hotmail application.
Only attempt to access attachments you trust as safe.


Forward Workaround While Hotmail cannot open blocked attachments, it allows users to forward the message with the blocked file still attached.
Send the file to a different email client, and open the attachment using that account instead. Note other clients may have different security measures, but some will still block access to executable files and other potentially harmful data.

Compression Workaround

Ask the sender to package the attachment into a ZIP, RAR or other compressed file format before attaching.
Hotmail will not block any file type located inside a compressed archive.
Both Windows and OS X can create compressed ZIP files, and free utilities such as Zipeg and 7-Zip can create many other types of archives as well.
Some email clients, such as Gmail, will not allow users to send some file formats, even when packaged into an archive file.


http://windows.microsoft.com/en-US/windows7/Compress-and-uncompress-files-zip-files


http://ask-leo.com/windows_live_hotmail_has_blocked_some_attachments_how_do_i_get_around_that.html

Aug 24, 2013 | Computers & Internet

1 Answer

I can sign in to Hotmail, but I can't open any of the messages


Windows Live Hotmail allows users to view attachments within a Web browser or save them to the system's hard drive.


If Hotmail can't open an attachment, the problem lies with an incompatible file format or Hotmail's automatic blocking service.


You may need new software installed on your computer IE: adobe . direct x , zip for opening unfamiliar formats, while blocked files are permanently inaccessible from within Hotmail.


Accessing these files requires action by the sender or forwarding the file to a different email client.


Incompatible File Format


Occasionally a sender may attach a file that simply doesn't work with any software you have installed on the system.


Attempting to open the attachment will result in a "Windows cannot open this file" message or similar error display.


Many programs use very specific file formats that don't operate with most other software, such as Photoshop's PSD image files or Microsoft PowerPoint's PPT files.


Ask the sender to convert the file to a more widely compatible format, or install the appropriate software on the system to open the attachment.


Blocked Attachments


Hotmail blocks attachments it believes may contain unsafe or otherwise malicious code.

This includes any and all executable file types, including MSI, EXE, HTML, STC and COM files, along with many others.


Attachments blocked in this way result in a "Windows Live Hotmail has blocked some attachments" message when viewing the email.


While this service does block many real threats to system security, Hotmail may occasionally deny access to an item from a trusted sender.


Unfortunately, these files become permanently inaccessible once blocked by Hotmail, and accessing them requires using a workaround outside the Hotmail application.


Only attempt to access attachments you trust as safe.

Forward Workaround


While Hotmail cannot open blocked attachments, it allows users to forward the message with the blocked file still attached.


Send the file to a different email client, and open the attachment using that account instead.


Note other clients may have different security measures, but some will still block access to executable files and other potentially harmful data.


Compression Workaround


Ask the sender to package the attachment into a ZIP, RAR or other compressed file format before attaching.


Hotmail will not block any file type located inside a compressed archive.

Both Windows and OS X can create compressed ZIP files, and free utilities such as Zipeg and 7-Zip can create many other types of archives as well.


Some email clients, such as Gmail, will not allow users to send some file formats, even when packaged into an archive file.


Hope this helps

Nov 04, 2012 | Computers & Internet

2 Answers

Yahoo email has trouble attaching files...


Please check your Firewall Settings

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1 Answer

Unable to receive emails from certain contacts


I'm assuming that "send" should be "receive" because you most definitely can send attachments from a Hotmail account, no matter what type, as we'll see in a second.
There are two solutions, neither of them pretty:
  1. Have the sender send the attachment again, with a different name, or as a compressed file. ".zip" files are fine. ".exe" files are not. So if your sender creates a .zip archive of the .exe file that he's trying to send you, that you can save, and then decompress back into it's original form and name.
    Heck, just renaming the file is enough. Have the sender rename the .exe file into a .txt file and send that as an attachment. You'll be able to download it, and then rename it back to a .exe.
  2. Forward the attachment to a non-Hotmail account. Hotmail doesn't mention this approach, but sure enough, even though you can't open the unsupported attachments, you can forward them to a different account on a different service. If that service allows you to open the attachment, you've got it.
Hotmail's goal here is, obviously, to make it difficult to open malware in attachments by accident. You have to take steps of some sort; you have to think about it.
If you go through those steps, and you still get infected? Well, it was your own doing.

Nov 23, 2008 | Microsoft Windows Live Messanger

1 Answer

Notepad attachments read out in machine language. i run Vista.


it means you don't have the program to open that file attachment you may ask the file sender what is that file and what program it was made from

Oct 23, 2008 | Yahoo Mail

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Can you receive pics through an email on an iphone?


no this is not true, i recieve emails all the time with pictures

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Opening downloads on emails


all you need to know is the file extension of the file you downloaded. there are some common file extensions when attaching to the email . pdf , doc, if pictures the JPG,PNG, BMP, and many more. however if u have an office application program (Microsoft office,open office) all office files will be opened but if the file extension is PDF you must download and install the PDF reader. you can download it here http://www.adobe.com/products/acrobat/readstep2.html.
Take note! Any other files which you don't whose the sender and the extension files is not on office application program not pdf or picture files maybe can harm your system so be sure to know the files.

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