Schedule to default location BUT change file name

Hi Folks -

We have a case where we need to change the file name of the PDF output of a scheduled instance. (Each time it runs, we add the execution time, and then keep a number of historical instances which are copied off to another location.) When setting up the schedule, the option to change the destination file name/extension is only available if you do NOT use the "default enterprise location". This appears to be the case in both XI3 and BI4.

So, my question is two-fold:

1. Is there any way to use the default enterprise location but somehow change the file name/extension when setting up the schedule?

2. If not, if one schedules to a file location, what path could one use (ON LINUX, NOT WINDOWS) to indicate that default enterprise location? We tried simply putting '.' (without quotes), but that actually caused the output to be saved in the server's root installation directory, not the Output FRS.

Thanks,

Amy