A fasl file extension is related to the Scheme programming language and used for its compiled source codes.
FASL file extension - Scheme source code
What is fasl file? How to open fasl files?
File type specification:
The fasl file extension is associated with the Scheme a functional programming language a dialect of Lisp programming language developed in 1975.
The fasl file contains compiled Scheme source code.
This fasl 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.