Files with dec file extension may also be encountered as some kind of hyperhelp supporting files for ESRI ArcView, now known as ArcGIS.

There are 4 other file types using
the DEC file extension!

empty icon.dec - DEC DX WPS Plus document

empty icon.dec - Dolphin EasyConverter project

empty icon.dec - Magic: The Gathering deck of cards

empty icon.dec - VersaPro declaration data

DEC file extension - ArcView UNIX hyperhelp supporting data

What is dec file? How to open dec files?

File type specification:

Various data file type icon Various data file type

The dec file extension is used by ArcView (also known as ArcGIS for Desktop Basic) a GIS (Geographic Information Systems) software for Microsoft Windows operating system.

This type of .dec file contains UNIX hyperhelp supporting data for ArcView.

The default software associated to open dec file:

ArcGIS for Desktop Basic (ArcView) icon

Esri logoArcGIS for Desktop Basic (ArcView)  Microsoft Windows software

Company or developer:

ArcGIS for Desktop Basic (formerly known as ArcView) is GIS (geographic information system) application used to visualizing, managing, creating, and analyzing geographic data.

ArcGIS for Desktop Basic is a part of the ArcGIS Desktop. ArcGIS for Desktop Basic supports creation of interactive maps, spatial analysis, GIS deployment, map viewing and navigation, map printing etc.

Help how to open:

It looks like you can work with this type of *.dec file only in the original ArcView tool.

How to convert:

We do not know about any possible conversion at this time, it may not even be possible.

List of recommended software applications associated to the .dec file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open dec file, edit dec file, convert dec file, view dec file, play dec file etc. (if exist software for corresponding action in's database).

Unspecified and all other actions for computer programs working with dec file - ArcView UNIX hyperhelp supporting data

Click on the software link for more information about ArcGIS for Desktop Basic (ArcView). ArcGIS for Desktop Basic (ArcView) uses dec file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).

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