MADRID, July 24 (Reuters) - Spain's antitrust regulator

said on Wednesday it had opened an investigation into possible

anti-competitive behaviour by Apple's ( AAPL ) app store.

The CNMC, as the regulator is known, said Apple ( AAPL ) may have

incurred in anticompetitive practices when imposing unequal

commercial conditions on developers of mobile applications sold

at its app store.

The practices could be considered a very serious violation

of the competition law and thus could be punished by a fine

worth as much as 10% of the company's global revenues, CNMC said

in a statement.