Hardware Reference
In-Depth Information
Microsoft Word: .doc , .docx
Microsoft PowerPoint: .ppt , .pptx
Microsoft Excel: .xls , .xlsx
Web pages: .htm , .html
Apple Keynote: .key
Apple Numbers: .numbers
Apple Pages: .pages
Preview and Adobe Acrobat: .pdf
Rich Text: .rtf and .rtfd
Text: .txt
Contact information: .vcf
Keeping files in order
In very simple terms, computers of any type, including tablets like the iPad — and the software that
runs on them — must have some way to recognize the files that run on the system and to act appro-
priately upon them. Long ago, the bright minds in technology cooked up standard ways to organize
the layout of data so files that serve a particular purpose adhere to a similar structure. You recognize
such files by filename extension, the suffix that is separated by a dot or period after its name. Of
course, many more file formats exist than most folks will ever need to become familiar with. But you —
or, more precisely, the hardware and software you're working with — will encounter some popular file
types repeatedly. Such formats include .doc for Microsoft Word documents and .jpg for images. If any
computer you're using ever encounters files on it that don't seem to open or respond, it's likely be-
cause the machine doesn't have the software to recognize such files. The good news is that the iPad
supports most of the common file types it encounters, though not quite every file type.
If the attachment is a file format that the iPad doesn't support (for example, a Pho-
toshop .psd file), you see the name of the file but you can't open it on your iPad, at least
without an assist from third-party apps that you may have installed and, in some instances,
Apple's own apps.
Here's how to read a supported attachment:
 
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