The 3D file extension is related to the Geocadabra software.
There are 3 other file types using
the 3D file extension!
.3d - 3D drawing CAD data [common]
.3d - Survex 3D cavern
.3d - Advent 3B2 document
Detailed description
Software that open 3d file
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What is 3d file? How to open 3d files?
The 3D file extension is associated with the Geocadabra a tool for Microsoft Windows operating system that allows users to create drawing in maths education. The *.3d file stores various data used by Geocadabra.
The default software associated to open 3d file:
Geocadabra 
Company or developer:
Visiria
Geocadabra is a program used for drawing geometry and other mathematical functions for educational purposes.
Help how to open:
Due the variability and uncertainty of this file type group, there is no general information available, about how to open this various data file format. However most files with extension from this group are usually not meant to be opened or viewed directly. If there are associated applications or programs listed below the extension description, you can always try to check their website for additional informations on their forums or other type of customer support.
For general information try to look at:
Identifying unknown file formats
How to convert:
Due the variability and uncertainty of this file type group, there is no general information available, about how to convert this various data file format. However most files with extension from this group are usually not in formats, which can be converted. If there are associated applications or programs listed below the extension description, you can always try to check their website for additional informations on their forums or other type of customer support.
List of recommended software applications associated to the .3d 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 3d file, edit 3d file, convert 3d file, view 3d file, play 3d file etc. (if exist software for corresponding action in File-Extensions.org's database).
Unspecified and all other actions for computer programs working with 3d file - Geocadabra file
Click on the software link for more information about Geocadabra. Geocadabra uses 3d 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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