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I'm writing an article about DOCX, PDF and ZIP extensions. But first, I need to know the programs which are used to open these extension as default (without any third-party applications).

I don't have a Mac or any OS X based systems, so I can not complete my article. What applications open these kinds of files?

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up vote 2 down vote accepted

Microsoft .docx files, can be previewed using QuickLook. To do that, just press Space after selecting such a file. They can be opened with TextEdit since OS X 10.5 (thanks, Duvrai).

PDFs (and all kinds of images) are opened by Preview.app. Many people prefer to use free and open-source Skim as a replacement PDF reader.

ZIP files and several other archive types are opened by Archive Utility (previously called BOMArchiveHelper until OS X 10.5). The Unarchiver is a well-known alternative to Archive Utility, which supports more file formats.

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docx opens in TextEdit since at least OS X Lion (10.7). – Duvrai Feb 23 '14 at 20:21
1  
Note that Archive Utility has almost no UI — the only thing it does is unpack the contents of archives into a new folder. It cannot be used to modify an archive in-place (which I've often seen Windows users assume is normal functionality). – Kevin Reid Feb 23 '14 at 21:00
    
@Duvrai You're right, thanks. – slhck Feb 24 '14 at 6:57

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