A qaa file extension is related to the WinQSB and used for its data files.
QAA file extension - WinQSB data
What is qaa file? How to open qaa files?
File type specification:
The qaa file extension is associated with the WinQSB, a package of tools for decision analysis available for Microsoft Windows operating system.
The qaa file stores some kind of data.
The WinQSB seems to be obsolete product.
This qaa 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.