Hi,
Have a look at https://www.appeon.com/standardsupport/search/view?id=7649. There's an attachment somewhere with a security bulleting from Appeon.
Yes, you can delete them. I don't think there'll be a replacement for them, since Appeon doesn't really use them. It's just left-overs from the past.
Apart from the files mentioned in the bulletin, you might also want to get rid of this one:
C:\Program Files (x86)\Sybase\Shared\PowerBuilder\WEB-INF\lib\eas-client-15.jar contains Log4J-1.x <= 1.2.17 _OLD_ :-|
The one mentioned above is from my PB12.6 installation. I imagine there must be something similar to the 11.x version.
regards.