Man sees sniper !

From a high building he sees a rifle emerging from a curtain and kills someone. It then 'sees' him and he then goes on the run from an unknown assailant! He meets a girl and they go to a hotel. A knock at the door says 'room service' ,she opens door(on the chain) and a knife tries to stab here but cant get her because of the chain. Think it might be Jimmy Stewart (not Rear Window) or someone very like him.

So this is an old movie?

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7 days to condor?

Okki2, Are you sure you don't mean "Three Days Of The Condor" from 1975?

TooSoonTom, if it is a movie starring James Stewart then "The Man Who Knew Too Much" from 1956 has the bit about a sniper hiding behind a curtain ready to kill a foreign Prime Minister but only wounds him. The rest of your description doesn't fit though.

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