Microsoft is seeking to reassure the industry it is open to competition by publishing a dozen "tenets to promote competition".
The rules were announced by Microsoft vice-president Brad Smith and come after the company was fined for the second time by the European Commission for acting in an anti-competitive manner.
The commission fined Microsoft 280.5m euros (£160m) earlier this month, and threatened it with new fines of up to 3m euros a day for continued failure to comply with its 2004 anti-trust judgement.
The 12 principles include allowing computer manufacturers to set defaults as they wish, instead of exclusively to Microsoft applications.
In addition, Microsoft pledged it would give outside software developers the same access to Microsoft technical information as Windows developers were given.
This will allow them more easily to build rival products that work in a Windows environment.
The company has also promised not to retaliate against computer-makers that support non-Microsoft software.
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