Files with a3d file extension can be found as 3D models from a long discontinued program called Amapi.
There is one other file type using
the A3D file extension!
.a3d - Alternativa3D exported data
Detailed description
Software that open a3d file
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What is a3d file? How to open a3d files?
The a3d file extension is mainly related to old 3D graphic format used by Amapi program.
Amapi was a software used for the conception and creation of high-end 3D models, often used for product design and architecture. It was discontinued in 2006.
This a3d file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.
The default software associated to open a3d file:
Amapi 3D 
Company or developer:
Eovia
Amapi 3D is 3D modeling software for Microsoft Windows aimed on advanced as well as novice users. Looks like discontinued product.
Help how to open:
You can work with these files in old Amapi program.
How to convert:
Some converters still support this 3D model format and can convert it to some other format.
Find conversions from a3d file:
a3d to 3ds
a3d to step
a3d to stl
a3d to stp
Find converter to a3d file type:
stl to a3d
List of software applications associated to the .a3d 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 a3d file, edit a3d file, convert a3d file, view a3d file, play a3d file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting a3d files.
Software that open a3d file - Amapi 3D modeling data
Programs supporting the exension a3d on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about Amapi 3D for open a3d file action.
a3d file viewer - programs that view a3d file - Amapi 3D modeling data
Programs supporting the exension a3d on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about 3D Object Converter for view a3d file action.
Programs that can create a3d file - Amapi 3D modeling data
Programs supporting the exension a3d on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about Amapi 3D for create a3d file action.
Software that import a3d file - Amapi 3D modeling data
Programs supporting the exension a3d on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about 3D Object Converter for import a3d file action.
Applications that export a3d file - Amapi 3D modeling data
Programs supporting the exension a3d on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about 3D Object Converter for export a3d file action.
Unspecified and all other actions for computer programs working with a3d file - Amapi 3D modeling data
Click on the software link for more information about Amapi 3D. Amapi 3D uses a3d 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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