Many Mac Mail users who send and receive emails with their Windows counterparts using a mail client like Outlook or Microsoft Exchange will discover a â file attached to those emails. If you try to open a file on Mac OS X, youâll usually find there is nothing available to open the attachment, or it often contains gibberish and is illegible. Weâll show you several ways Mac users can open files attached to emails. Weâll also explain what a file is and where they come from. What is a File? files are generated by Microsoft Exchange and Microsoft Outlook, Mac users typically find them arriving in emails sent from the Windows world and opened in Mail app, and the files can be one of two things; rich text formatting for an email for example, bolded text, or a stylized HTML email signature, a vcard, and less often, they can be an actual email attachment file which has been wrongly identified as but is actually a Word document, calendar invite, Excel spreadsheet, RTF file, or some other legitimate file type that has been attached to the message. 3 Ways to Open Files on a Mac Do keep in mind if the file is simply a rich text version TNEF of the email that has been received, there is little reason to open it, as it would simply be a stylized version of the email you already received much like the difference between TXT vs RTF files. In fact, Apple actually tells you to ignore files completely if they arrive in Mail app, which is often fair advice, but in some situations the file is an actual email attachment that has been misidentified, and thus need to be opened. Because it can be difficult to know the difference between the two ahead of time, itâs important to know the intention of the email sender, if itâs just a casual message with a small file attached, it can usually be ignored, whereas if the sender is referring to an attached document which has shown up as a file instead of whatever they reference, youâd likely want to try and open it. There are several ways to open and access files in Mac OS X, weâll cover three of them; one involving a relabeling trick, another using an application, and another using a webmail client Method 1 Saving the File as the Intended File Type Often the easiest way to open a file in Mac OS X is to save it and relabel the file as the intended file type. For example, if you get an email from an Outlook user in Windows saying âattached is the import Microsoft Word documentâ then youâd know it is supposed to be a .doc or .docx and can be treated accordingly. Be sure you have the show file extensions feature of Mac OS X enabled for best results. Open the email message containing the file in Mail for Mac Right-click or Control+Click on the file contained in the message and choose âSave Attachmentâ In the save dialog box, remove the datâ extension and replace it with the intended attachment file type for example, .rtf, .docx, or .pdf, then save the file as usual to a place you can access it in the Finder Open the saved and renamed attachment file as usual, it should open without incident with the new file extension This is admittedly a little silly, but file extensions identify what a file is and how it opens in all operating systems, so even if a file is one type it can be misconstrued as being another if the extension is wrong â whether Mac OS X or Windows. The good news is despite being a bit of a workaround, this works to open files almost always on the Mac, assuming itâs a file that has been misidentified. In this example, a file has been wrongly identified as belonging to VLC, but itâs actually just a docx file, thus renaming the extension and opening the docx in Mac OS X as usual allows the once erroneously named file to be seen as intended. In this case it was a docx file that was quite simple so it opened fine in TextEdit with the new file extension You can also save the attachment to the Finder and relabel the extension there, which can then be opened as usual. Method 2 Use TNEF Enough to Extract Files in Mac OS X If youâre a Mac user who frequently encounters many emails sent from Windows users with attachment files, another approach is to use a free tool called âTNEFâs Enoughâ Sound it out, teneffs enuff â creative!. This is probably the best approach if you see and encounter many files on the Mac whether in Mail or otherwise and want to always get to the bottom of them quickly. Get TNEFâs Enough from the Mac App Store free Once installed, you can use TNEFâs Enough with the âopen withâ menu, or by dragging and dropping the files into the application itself. The app will then sort out what the file is supposed to be for you, which you can then save or export yourself directly from the app. Often youâll find the file is just a boring rich text formatted email sent from Microsoft Outlook or Microsoft Exchange, but as weâve mentioned, they can also be misidentified attachments too. The creator of TNEFâs Enough describes the utility as follows TNEFâs Enough allows Macs to read and extract files from Microsoft TNEF files. The files are usually received via email from Microsoft Exchange and Microsoft Outlook users. Standard e-mail programs will receive the TNEF file as an attachment named â The â file can contain attachments, contact files .vcf or calendar files .ics as well as a rich text or HTML version of the email body. TNEFâs Enough can open the â file and allow you to extract the attachments. This app works really well, so if you find yourself with a regular dose of mysteries to deal with, itâs a worthwhile install. Itâs free, and thereâs even an iOS version available too for those who encounter the same attachments on the mobile side of things. Method 3 Forward the Email with to Gmail The Gmail web based email client has no problem handing files, and will almost always accurately interpret the as either a rich text formatted email, or as an accurate file attachment. This is literally just a matter of forwarding the email in question to your own gmail account, then opening in a web browser to view and open the file. The file will either be rendered as a formatted email as intended from the Microsoft Outlook / Exchange side of things, or you can open it within Google Docs on the web. This forward approach is not a fancy solution, but it works great. Finally, you can also just request the sender in the Windows world stop sending their emails in rich text format and instead send them as plain text, but thatâs not always possible, and not every sender is compliant. Plus, with how popular HTML signatures are, it may not be a reasonable solution anyway.