ProDOS 8 prefix on launching SYS files from GS/OS ?

[Oliver Schmidt <ol.sc@web.de>]

Hi,

I'm currently developing a ProDOS 8 SYS application and wonder about
the user experience for GS/OS users.

When launching a 8 bit SYS file from GS/OS then the system "boots
into" ProDOS 8. From that I'd expect that the ProDOS 8 prefix is set
the same way it is set when directly booting ProDOS 8 (which is it is
set to the volume directory of the boot drive) - is that correct?

Is there a way that a user can manipulate / override that behaviour?

I've read that a user can "associate" a "file type" with a certain 8
bit SYS program. Does file type here mean a ProDOS 8 file type or does
it mean a name suffix?

As far as I understand launching such an associated file actually
means launching the SYS program with the associated file as startup
parameter - is that correct?

What about the prefix in that scenario. Just like in the general
scenario above?

Thanks in advance for hints / answers, Oliver