Files with vsy file extension can be found as part of VNC Spy network traffic analysis program.
VSY file extension - VNC Spy data
What is vsy file? How to open vsy files?
File type specification:
The vsy file extension is mainly related to VNC Spy, an open source program used for sniff network traffic, and report VNC key strokes that it sees. Seems somewhat old.
This vsy 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.