Perico de los Palotes

Hi, all. I hope I am in the correct group.

I have Vista and Adobe Photoshop configured to open picture files. I am
trying to open several files (jpg) at the same time, selecting them and
using the File-Open option. Problem is, that option now only works with up
to 15 files; it disappears with 16 or more. Same with the "Open With"
option. This was not a problem with XP. Does anyone know if there is a
setting to change this limit?

Thanks in advance for any help.