A New York senator is calling for an investigation into "anti-competitive" practices in Microsoft's forthcoming Windows XP operating system.

A statement released by senator Charles Schumer's office will "demand that Windows XP allows users to choose their media player, messenger service and other applications".

Schumer, a Democrat, will call upon state attorneys general to look into the release of the operating system, and will discuss upcoming US Senate Judiciary Committee hearings on the matter scheduled for September, according to the statement.

Dominance Windows XP has raised competition concerns because of the way that it integrates components, such as Windows Media Player and MSN Messenger, into the operating system. Critics feel that integrating applications into Windows XP is another way for Microsoft to create dominance for its other applications.

The same issue is partly at the heart of the US Department of Justice's ongoing antitrust case against the company. In this case, the government said that Microsoft linked its Internet Explorer Web browser to the Windows OS to gain market share and defeat competitor Netscape Communications.

Earlier this month, Microsoft said it would no longer require Windows licensees to include Internet Explorer as a preloaded application on new PCs.