It is a supported raster format
If it is supported it should be able to load and/or converted
What have you tried? Are you saying it won't load in arcmap or ArcGIS pro?
It may require the Data Interoperability extension then
The file extension comes up in the context of marine mapping. It may be an XYZ file format, so if you can check it with a text editor that may narrow down what it actually is.