ArcInfo line data
File type: Various data file
An aat file is an ArcInfo coverage arc attribute table that stores line data and attributes for arcs in a geographic coverage.
The file belongs to ArcInfo, a geographic information system from Esri.
Found 2 different file type records with the same aat filename suffix.
File type category:
Various data file
Date updated: October 28, 2026
The aat file extension identifies the arc attribute table used by an ArcInfo coverage. It stores records for the coverage's arcs, which are the line segments used to represent linear features and polygon boundaries, together with their associated attributes and topology information.
ArcInfo was developed by Esri, formerly known as Environmental Systems Research Institute. The first version was launched in 1982 for minicomputers. The format is part of the older ArcInfo coverage data model rather than a standalone modern GIS exchange format.
ArcInfo was available for Microsoft Windows as well as other platforms. Coverage data and its related tables are now considered legacy GIS data, although they may still be encountered in older mapping and geographic-information projects.
Open the aat file with ArcInfo on Microsoft Windows. It is normally used as one component of an ArcInfo coverage, so keep it with the other files and tables from the same coverage rather than opening it as an independent document.
If ArcInfo cannot read the file, the complete coverage may be incomplete or the file may not belong to the expected coverage directory.
An aat file is not normally converted by itself because it is one component of an ArcInfo coverage. Use ArcInfo to export the complete coverage to a supported GIS format, such as a shapefile or geodatabase feature class, when a modern format is required.
The available attributes and topology may need checking after export, particularly when converting older coverage data.
File type category:
Settings, options, themes or skins file
Date updated: October 28, 2026
ArchiCAD is building information modeling software from Graphisoft. On Microsoft Windows, it uses aat files to transfer saved project attributes between projects.
An aat file is created when attributes are exported from ArchiCAD. It is part of ArchiCAD's project-settings workflow rather than a general-purpose document format.
Open or load an aat file from within ArchiCAD using its attribute management or attribute transfer tools. The file is intended for ArchiCAD on Microsoft Windows and is not normally opened as a standalone document.
An aat file is not normally converted to another format. To use its contents, load or import it into another ArchiCAD project through the software's attribute transfer tools. Compatible tools may be able to export aat files to other formats.
Software applications that can open aat files:
Microsoft Windows
Software apps that create aat files:
Microsoft Windows
Software apps that import aat files:
Microsoft Windows
Software apps that export aat files:
Microsoft Windows
Software apps that manage or store settings in aat files:
Microsoft Windows
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