Files with sbn file extension can be often found as some sort of spacial index files for ArcGIS / ArcView read-write shapefiles.
Software that open sbn file
SBN file extension - ArcView spatial index for read-write shapefiles
What is sbn file? How to open sbn files?
File type specification:
The sbn file extension is mainly associated with ArcView / ArcGIS geography software from ESRI.
The sbn file contains binary spatial indexes, which are used only by ESRI software. The format is not documented, and is not implemented by other vendors.
The sbn file is not strictly necessary, since the shp file contains all of the information necessary to successfully parse the spatial data.
The default software associated to open sbn file:
ArcGIS for Desktop Basic (ArcView) 
Company or developer:
Esri
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.
List of software applications associated to the .sbn 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 sbn file, edit sbn file, convert sbn file, view sbn file, play sbn 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 sbn files.
Programs that can create sbn file - ArcView spatial index for read-write shapefiles
Programs supporting the exension sbn on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about ArcGIS for Desktop Basic (ArcView) for create sbn file action.
