inoculan and backup agent for open files driver - trying to track- down a problem

Hello,
Do any of you file system file system filter implementors have any
experience co-existing with Cheyenne’s Inoculan file system filters
(ino_flpy.sys, ino_fltr.sys - note I am assuming these are file system
filters) or cheyenne’s backup agent for open files driver (ofant.sys).
These drivers are all stamped from July 1998. Were there any known issues
with these drivers that would make it difficult for another file system
filter to live with (i.e. the sort of things that would require you to
include ‘special case’ code in your own file system filter)? I know there
were many interoperability issues with file system filters in the past, but
that was before my time.
Any info would be appreciated.

Thanks,
Joel