(See figure 1.)įigure 1_Applications on the Mac have the file name extension “.app” What you may not have noticed is that Mac applications themselves have an “.app” extension.

Those files are word processing documents. Similarly, you may have noticed that files with extensions “.docx” or “.doc” are opened on the Mac by Microsoft Word or TextEdit. You may have noticed that files with extensions “.jpg” or “.jpeg” are opened by the Preview app on the Mac. File Extensionsīoth PC and Mac computers use three- or four-letter extensions on file names-the portion of the name after the period-to determine which application can open a file. The longer, more positive answer requires a little background. The quick, short answer is, “ By itself, the Mac can’t open this file.” How can I open this file?įrom a person who only uses Mac computers and iPads, this is a very reasonable question.

My friend asked me to download a file named Paint-tool-sai.exe, but I can’t open it on my Mac. I frequently get questions like this from Mac users: exe from your Mac by using Parallels Desktop® for Mac.

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