Netanyahu praised Macri for jump-starting efforts to solve the crimes.
On his arrival, Netanyahu paid homage to the victims of two bombing attacks that targeted the Israeli and Jewish communities in Buenos Aires.
Netanyahu's statement came after a report by Reuters suggested that both Israel and Saudi Arabia - two us allies that have been strongly opposed to the Iran deal - were in favor of the usa remaining in the pact, despite their reservations about Iran's adherence to the agreement.
"We know, without a doubt, that Iran and Hezbollah were backing up and in fact initiating these attacks", Netanyahu said. Hezbollah is an Islamist militant group based in Lebanon. Critics accuse previous Argentine leader Cristina Fernandez of trying to improve ties with Iran rather than focusing on bringing the bombers to justice. "I honor his commitment and the integrity of his effort to determine what happened", Netanyahu said.
The embassy attack killed 29 and injured 220, while the community center blast left 85 dead and 300 injured.
The prosecutor, Alberto Nisman, was discovered on the floor of his Buenos Aires apartment with a pistol by his side and a bullet in his head.
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Macri won the presidency and succeeded Fernandez in late 2015.
The five hard drives include almost 140,000 photographs and secret files spanning the years from 1939 to 1950 and include reports, telegraphs and letters that were digitized by Argentina and the U.S. Holocaust Memorial Museum in Washington DC.
Macri, who has met with Nisman's family, says resolving the death of the prosecutor and the bombings remain among his government's top priorities.
Israel's Prime Minister Benjamin Netanyahu was handed thousands of digital World War II documents on Tuesday - the second day of his visit to Argentina - by Argentina's President Mauricio Macri.
The digital documents delivered by President Mauricio Macri include almost 140,000 secret files and photographs from 1939-1950. He is also scheduled to visit Colombia and Mexico before going to NY, where he will address the U.N. General Assembly on September 26.