Files with sbox file extension is related to the sBOX meta-file format.
SBOX file extension - sBOX file format
What is sbox file? How to open sbox files?
File type specification:
The sbox file extension is associated with the sBOX, a meta-file format for creating file formats whose internal contents are indexed by name.
Seems to be obsolete without support from developer.
This sbox file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.