Cross-platform alternative to a windows shell extension - WebDAV platform?

I want to build a cross-platform (windows, mac[, linux]) desktop application that allows directory browsing and drag-and-drop functionality for accessing a cloud-based enterprise CMS. This will replace an existing (and slightly buggy) windows shell extension that talks to a REST API hosted by IIS.

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I'm currently looking into leveraging WebDAV, but I'm having trouble finding a cross-platform library for building the client(s). I'm looking for advice and suggestions for what technologies and/or libraries to leverage to make this project go smoothly. My preferred languages are C# and Java, and an ideal solution would be able to map a drive. Also - I do have a budget and I don't mind supporting fellow programmers.

Thanks a ton for any ideas or knowledge you can provide.

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You might have more joy implementing ssh and sftp. There are a number of very good graphical sftp clients such as winscp

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Most OS'es provide built-in WebDAV client that is installed by default in many cases. Windows provide Mini-redirector, Mac OS X provide Darvin, many Linuxs provide davfs2. You can mount a drive or map folder from OS UI or programmatically. Each OS and WebDAV client has its own specifics and sometimes bugs.

With the release of IE 10 you can build an Ajax WebDAV client that runs in all 4 major browsers. Or deploy some existing client, like this one: ajaxbrowser.com.

Both cases may reduce your time building a cross-platform WebDAV client.