Files with the “.DAT” extension on Macs are used by many programs to store data. These can be text, pure binary data, or more. It is difficult to determine which programs are using these files due to the breadth of their functionality, but you could try opening them with a text editor like TextEdit to explore them and try to find out what they are or what applications they are. can be linked. The ones you will encounter most frequently are malformed email attachments, which may be named winmail.dat or ATT0001.dat.
Method 1 of 2: Use TextEdit
Step 1. Right click on the dat file
You will see a pop-up menu showing you the operations to perform on this file.
- If you are using a type mouse Apple Magic or a MacBook with a touchpad, you can emulate a right click by tapping with two fingers on the pad or on the mouse.
Step 2. Hover over Open With… with your mouse cursor
You will see a list of applications that can open this file.
Step 3. Click TextEdit
This program can read most files with text-based content. This will allow you to attempt to read the contents of a.dat file to try to determine which program it was generated by. If TextEdit cannot open it, it will most likely be a file that has no text or could be locked, and therefore cannot be read. If this file consists of purely binary data, you can also try to open it with a hex editor like iHex.
Step 4. Look for an indication in the text
Try to locate a piece of text that can give you information about the program with which the file might be linked..Dat files do not have a predetermined structure or formatting and often consist of a series of parameters or instructions intended for a very specific application which alone will be able to interpret their content. If you see that there is a mention of a program, it will most likely be associated with the.dat file whose membership you are trying to decipher. In this case you should try to open it with the program mentioned in this text.
Method 2 of 2: Open a Winmail.dat or ATT0001.dat file
Step 1. Open the email with an attached document named Winmail.dat
Winmail.dat or ATT0001.dat files are often incorrectly formatted attachments from email clients like Microsoft Outlook.
Step 2. Click the icon
located next to the attached document.
You will see a drop-down menu with options applicable to the attached document.
Step 3. Click Save As…
This will remove the attached document from the email and then save it to your computer.
Step 4. Open your web browser
Go to the site http://www.winmaildat.com. You can use any browser. Safari, which you will recognize by its icon representing a blue compass, will be perfect for this manipulation.
Step 5. Click Choose File
This button is next to Send a file on the web page of winmaildat.com page. You will see a file explorer window that you can use to navigate between folders and documents on your Mac and choose a file.
Step 6. Select the winmail.dat or ATT0001.dat file
Use the file browser to locate the.dat document from your email client where you saved it on your Mac, then click its icon to select it.
Step 7. Click Open
This will send the selected file to the winmaildat.com site.
Step 8. Click Begin
This is the blue button located on the winmaildat.com web page. The process of extracting data from the file will begin on the website. Wait a few moments for the data extraction to complete.
Step 9. Download the data from the website results page
The extracted data will be kept available to you on the web page for approximately 30 minutes. If you do not see anything displayed on the site results page, the data could not be extracted from the file you submitted.