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This looks promising. Are there supports for native file system access, databases (SQLite?), and network access?

file system access, yeah! It should feel like node.js (on purpose): http://mozilla.github.com/chromeless/#guide/filesystem-acces...

databases, IndexedDB should "just work", and thinking exposing SQLlite is worthwhile.

only the most basic network libraries at the moment.

Would it be possible to use Chromeless to tell the operating system to have a specific file opened by its default native application? So you could have a collection of links in a Chromeless app, that represent files on the user's computer, and the user could click a link for say an Excel file, and Excel would launch and show the file? Ideally this is what the new FileSystemApi needs, so that a web-based "dropbox" becomes possible. At the moment, any kind of web-based file manager must result in downloads to get most files opened, and re-uploads, whenever the user changes the file.

Yes, maybe?, and yes. It's version 0.2 so it's not really the most functional yet.

It does support SQLite through Firefox 4's IndexedDB spec (sadly incompatible with the Web SQL Database API spec). And there's localStorage as well.

https://developer.mozilla.org/en/IndexedDB

Support of SQLite would be awesome. Lots of form-filling CRUD apps can be done.

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