I found a scroll describing that some guys loot had been hidden in the south of the temple ruins...now I´ve found the stash...but I can´t open the damned thing...is a key needed or what?

What temple?
Temple of Amunator.

By the way... I'm sorry about what happened to that plane to Milan

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"No!" shreiked Tyrion. Though the sword felt heavy as a fallen tree he lifted it. He saw the deamon look up, astonished. He brought down the blade with the awesome majestic power of a falling thunderbolt. The burning blade caught the deamon right in the centre of its forehead. The deamon's head fell apart under the force of the impact. The deamon N'kari sank to its knees, dead.

-Tyrion at the battle of the Blighted Isle.
Right now he is mourning for USA.

Thanx for the concern...pretty enerving since these things seem to happen in packs...
first WTC...then Afghanistan and now Milan...well life goes on!!!

The temple is the temple of Amunator ( Shadow dragon quest )
I found the weird scroll in the temple...some guy hid his stash in the south of the map...simply ´cause he didn´t know if he´d make it

The stash is part of the ranger stronghold quest.
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If u are a ranger then a tree spirit will ask u to help defend her forest from some men. If u go talk to them they will tell u they are looking for a family members stash and give u the other part of the scroll if u agree to go find it for them.

Spoiler
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and to get the ranger stronghold you have to complete the shade lord quest