.$d is TR-DOS data file format
Key Features: .$D File Extension
|Created by||Vladimir Kladov|
What is an .$D file?
TR-DOS data file format (Hobeta files)
Hobeta files store only one file of a virtual TR-DOS disk image. The file name contains the letter that is used to describe the file type: $B = Basic program, $C = Code, $D = DATA array.
This $d 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.