A wow file extension is related to the Grave Composer module format.
WOW file extension - Grave Composer module
What is wow file? How to open wow files?
File type specification:
The wow file is associated with an audio module format use by the Grave Composer, an audio tracker which is an older tracking program for DOS-based PCs. It is also known as "Mod's Grave" .
This wow 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.