Manatee

Files from a Windows PC that will not open on a Mac

· 7 min read

Most files from a Windows PC open on a Mac with no effort: PDF, DOCX, XLSX, JPEG, PNG, MP4, MP3 and ZIP are the same on both. The ones that fail belong to a short list. Windows Media video and audio need converting, some older documents need a newer format, a few things (programs and shortcuts) were never documents in the first place, and sometimes the drive is the obstacle, not the file. Work out which group yours is in and the fix is usually quick.

Start by seeing the real file type

Windows hides file extensions by default, so the person who sent the file may not know what kind it is. On the Mac, turn extensions on in Finder, Settings, Advanced, Show all filename extensions. Then select the file and press Command-I. The Kind line names the type as macOS understands it.

If Kind says only Document, macOS does not recognize the file, and the extension is your best clue.

Video and audio: WMV, WMA, ASF and AVI

These are the most common failures. QuickTime Player does not play the Windows Media formats, and an AVI depends entirely on which codec is inside it.

  • WMV and ASF video. Convert to MP4. How to convert WMV to MP4 on a Mac covers the choices.
  • WMA audio. Convert to MP3 or M4A.
  • AVI. Some open and many do not. If QuickTime Player refuses one, convert it to MP4.
  • MKV. It turns up on PCs far more than on Macs, and it also needs converting.

Manatee handles all of these in one drop. Open it, choose Convert, drop the files or a whole folder in, and pick MP4 for video or MP3 or M4A for audio. Each result is a new copy written beside its original, and the conversion runs on the Mac with nothing uploaded. Converting re-encodes the picture and sound, so keep the original as your master copy.

One exception: music or video bought years ago with copy protection. A protected WMA or WMV is locked to a license from the store that sold it, and no honest converter gets past that.

Documents: old Word files and odd attachments

  • A .doc file. This is the older Word format. Pages and TextEdit open most of them, though complex layouts can shift. To pass one on in a current format, see how to convert an old .doc to .docx. Manatee converts DOC to DOCX, RTF or TXT.
  • A DOCX, XLSX or PPTX that claims to be damaged. First check that it did not arrive with the wrong name; a DOCX or XLSX that downloaded as a .zip explains that case. If it really is damaged, Manatee’s Repair mode works on Word documents and on the container of XLSX and PPTX files, and it reports Fixed, Partial or Not fixable without ever changing the original.
  • Plain text with scrambled accents, or an encoding error. The file is fine; it was saved in an older Windows encoding. Text encoding Unicode (UTF-8) isn’t applicable shows how to open it.
  • winmail.dat. This is not a file the sender chose. Their mail program wrapped the message’s formatting and attachments in a package that only that family of mail programs can unwrap. Ask them to resend with the message format set to plain text or HTML, or to put the attachments in a zip.
  • .pub, .xps and other Windows-only document types. macOS has no reader built in, and they are not among the types Manatee accepts. Ask the sender to save the document as a PDF.

Images: BMP, ICO and vector clip art

Preview opens BMP and ICO files directly, so these rarely stop you. The trouble starts when another app or a website refuses them. In Preview, choose File, Export and pick PNG or JPEG, or drop a folder of them on Manatee’s Convert mode to do them all at once.

EMF and WMF files are a Windows vector format used for clip art and exported charts. Preview does not open them and Manatee does not accept them. Ask for a PNG or a PDF instead.

Things that were never documents

  • .exe, .msi and .bat. These are Windows programs and installers. macOS cannot run them, and no converter turns one into a Mac app. If someone meant to send you files and an .exe arrived, it is probably a self-extracting archive, so ask for a plain zip. Do not go looking for ways to run a program from someone you do not know.
  • .lnk. A Windows shortcut. It holds only the location of a file on the sender’s PC, not the file. They sent the shortcut by mistake; ask for the real document.
  • .url. A web shortcut. Open it in TextEdit and the address is on the line that begins URL=.
  • .rar and .7z archives. Finder does not open these by itself. RAR, 7z and tar.gz archives on a Mac covers what does.

When the drive is the obstacle

  • The drive is NTFS. Select it in Finder, press Command-I and read the Format line. A Mac can read an NTFS drive but cannot write to it, so files open read-only and saving fails. Copy them to the Mac first and work on the copies.
  • You need to go back and forth. Use a drive formatted as exFAT, which both systems read and write. FAT32 also works on both but cannot hold a single file larger than 4 GB.
  • Files arrive broken. A drive unplugged from the PC without being ejected can leave the last files written incomplete. Copy them again from the PC if you can. If the PC copy is gone and the file is a video, PDF or Word document, Manatee’s Repair mode is worth a try on a copy.

What a converter can and cannot do here

Manatee converts and repairs files; it does not run Windows software, open a drive the Mac cannot mount, or recover files that were deleted. It accepts 122 input types, including WMV, WMA, ASF, AVI, MKV, DOC, BMP and ICO from the lists above, and it never modifies an original. Everything runs on the Mac with no account and no upload. Every feature is free for 24 hours, then it is $9 once.

Data that is missing from a file cannot be rebuilt by any tool. A half-copied video may come back as its first several minutes, and that is the honest ceiling.

Questions

Can I make a Windows program run by renaming it? No. An extension is a label, and the contents are instructions written for a different system. Running Windows software on a Mac means setting up a Windows environment, which is a much larger project than opening a file.

Will converting a WMV to MP4 lose quality? A little, because the video is compressed a second time. It is rarely visible after one conversion. Keep the WMV so you never have to convert a conversion.

What about sending files the other way? The same idea in reverse: HEIC photos, MOV video and iWork documents are the usual trouble on a PC. How to convert files so they open on a Windows PC covers it.