An arcinfo file extension is related to the ArcInfo and used for its info files.
Software that open arcinfo file
ARCINFO file extension - ArcInfo info data
What is arcinfo file? How to open arcinfo files?
File type specification:
The arcinfo file extension is associated with the ArcInfo (also known as ArcGIS), a geographic information system (GIS) for working with maps and geographic information.
The arcinfo file contains data used to search for ARC/INFO coverages.
The default software associated to open arcinfo file:
Company or developer:
Esri
ArcInfo is GIS suite that contains ArcEditor, ArcView and ArcReader and adds advanced spatial analysis, extensive data manipulation, and high-end cartography tools. ArcInfo is now called ArcGIS for Desktop Advanced.
List of recommended software applications associated to the .arcinfo 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 arcinfo file, edit arcinfo file, convert arcinfo file, view arcinfo file, play arcinfo file etc. (if exist software for corresponding action in File-Extensions.org's database).
Unspecified and all other actions for computer programs working with arcinfo file - ArcInfo info data
Click on the software link for more information about ArcInfo. ArcInfo uses arcinfo 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.).
Microsoft Windows:
Main software associated with arcinfo file by default: ArcInfo
Other suggested software:
ERDAS IMAGINE