Problem in accessing to PO 7.50 Integration Builder and Enterprise Service Builder

Hi experts,

we have just installed PO 7.5. When I try to enter in PO 7.5 Integration Builder or Enterprise Service Builder a popup appears with this message:

"Do you want to open or save directory.jnlp from xxx.xxx.xxx (open/save/cancel)?"

or

"Do you want to open or save repository.jnlp from xxx.xxx.xxx (open/save/cancel)?"

What I have to do? There's some installations missing?

Thanks.

Best Regards.

Fabio