AMSTERDAM, March 23 (Reuters) - A U.S.-based web service, which Islam critic and Dutch right-wing lawmaker Geert Wilders planned to use to show his film critical of the Koran, said on Saturday that it had inactivated the site due to complaints.

"This site has been suspended while Network Solutions is investigating whether the site's content is in violation of the Network Solutions Acceptable Use Policy," the company said on the site www.fitnathemovie.com.

Wilders, who has given few details about his 15-minute film, has said he plans to release 'Fitna' on the Internet before the end of the month after Dutch broadcasters declined to show it. Fitna is a Koranic term sometimes translated as "strife".

Wilders still plans to show his film despite the setback, Dutch agency ANP reported.

"If need be, I will personally distribute DVDs in the Dam," ANP quoted him as saying. The Dam is the central square in Amsterdam, popular with both the Dutch and tourists.

Wilders' film has triggered fury in the Muslim world. The Dutch government has distanced itself from Wilders' views, fearing a backlash against the country in the Muslim world, similar to that against Denmark in 2006 after newspapers there published cartoons of the Prophet Mohammad.

On Saturday, about a thousand Dutch gathered in the Dam to protest against Wilders and his film.

The film is not so much about Muslims as about the Koran, Wilders wrote in a commentary in Dutch daily De Volkskrant on Saturday. He said Fitna was a last warning for the West.

Wilders had previously warned of a "tsunami of Islamisation" in a country home to almost one million Muslims.

He has been under heavy guard due to Islamic death threats since the 2004 murder of Dutch director Theo van Gogh, who made a film critical of Islam's treatment of women.

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