DEFINITION file format description

Many people share .definition files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .definition file can be edited, converted or printed with. On this page, we try to provide assistance for handling .definition files.

1 filename extension(s) found in our database.

.definition - Apple Automator Data Type Definition

The DEFINITION development files are related to Mac OS X. The DEFINITION file is an Apple Automator Data Type Definition. Automator is a scriptable application and can be controlled by AppleScript and JavaScript for Automation commands.

Mac OS X
Development files
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Apple Automator Data Type Definition related extensions:
Create ML Model
Node.js Binary Addon
Dyalog APL SALT Data
Psion OPL Batch File
MegaZeux World
FreeMarker XML Template

Naturally, other applications may also use the .definition file extension. Even harmful programs can create .definition files. Be especially cautious with .definition files coming from an unknown source!

Can't open a .definition file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

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