define myself'd file type using CFBundleDocumentTypes

I know I can def开发者_如何学运维ine file type using in appinfo.plist such as zip, pdf etc

Is it possible define any type with special extension, such as '.mydatafiletype' or '.datafiletype'

Welcome any comment

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Yes, you can. The documentation clearly states so.

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Sure you can.
Generally, you need to set UTExportedTypeDeclarations property in info.plist file.

The post here: How do I associate file types with an iPhone application?
Gives you a sample to do it.

Hope this helps.