My application saves certain variables into an Access 97 database file that I have named with a .sys extension.

Upon installation and launch on some new Vista computers, there is an Error 3051: The Microsoft Jet database engine cannot open the file C:\Bla\Bla.sys
It is already opened exclusively by another user or you need permission to view its data.

Is this possibly caused by the .sys name I chose? Does Vista block access to .sys files?