Files with bsq file extension are generally related to AcrView GIS program. These files contain band sequential images. Probably some sort specialized GIS format.
There are 2 other file types using
the BSQ file extension!
.bsq - BinScii binary archivne
.bsq - Control file
Detailed description
Software that open bsq file
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What is bsq file? How to open bsq files?
The bsq file extension is associated with ArcView, a powerful geoprocessing and analysis tool from ESRI for Microsoft Windows.
The bsq, bil, and bip formats represent ways of storing 24-bit images in memory or on disk.
The default software associated to open bsq 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.
Help how to open:
Use ArcView to work with *.bsq files.
How to convert:
Compatible tools may be able to export *.bsq files to other formats.
Find conversions from bsq file:
bsq to adf
bsq to apr
bsq to bip
List of software applications associated to the .bsq 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 bsq file, edit bsq file, convert bsq file, view bsq file, play bsq 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 bsq files.
Software that open bsq file - ArcView band sequential image
Programs supporting the exension bsq on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about ArcGIS for Desktop Basic (ArcView) for open bsq file action.
bsq file editor and apps that can edit bsq file - ArcView band sequential image
Programs supporting the exension bsq on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about ArcGIS for Desktop Basic (ArcView) for edit bsq file action.
Programs that can create bsq file - ArcView band sequential image
Programs supporting the exension bsq 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 bsq file action.
Unspecified and all other actions for computer programs working with bsq file - ArcView band sequential image
Click on the software link for more information about ArcGIS for Desktop Basic (ArcView). ArcGIS for Desktop Basic (ArcView) uses bsq 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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