Can I access local files?

I am writing an application using Adobe Air that will have to utilize and store media files locally on a user's computer. My marketing team now believes that a downloadable application that will be installed on a user's computer will be a dealbreaker for some users due to the fear of a virus, so now they are suggesting that we will have better sales numbers if people just need to log into a website to use the application. No problem, Air applications can be embedded into a website. But can an Air application embedded in a browser still store and manipulate files on a user's computer? Storing media files for a large number of individuals can become cost prohibitive, so rather than store them online, we would like to create a folder on a user's system to organize their files. Is this possible with a web-embedded Air application?
Thanks.

AIR applications are always installed on the user's computer. You cannot run an AIR application on a website. On a web page, you can include a link to download or install an AIR application.
AIR applications can access local files.
Flash Player applications can also access local files, but the user first grants permission. For example, see the FileReference.load() and FileReference.save() methods (added in Flash Player 10):
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/net/FileReference .html

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