iphone sdk 3.0 - What is the alternative of [NSBundle mainBundle] URLForResource:withExtension: in iOS 3 SDK -

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i developing ios app using ios 4.2 sdk, want app run on older devices iphone 2g ios 3.1.3. don't know alternative code:

nsurl *modelurl = [[nsbundle mainbundle] urlforresource:@"coredataapp" withextension:@"momd"];

it crashes on device, because urlforresource:withextension: method ios 4+.

please help. thanks.

its - 

nsurl *afileurl = [nsurl fileurlwithpath: [[nsbundle mainbundle]  pathforresource:path oftype:@"aif"]];

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