The by file extension is associated with PSpice, a full-featured, native analog and mixed-signal circuit simulator, developed by Cadence Design Systems, Inc.
The by file stores some kind of data.
How to open:
Use PSpice to work with *.by files.
How to convert:
As far as we know, this .by file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.