You can use Web Folders to browse the appstore from FormManager, or to publish forms directly from Designer, however you may encounter problems trying to connect to it using the following URL:
You will need to apply this fix first to enable Web Folders on your system:
http://support.microsoft.com/kb/888123/en-us (Follow method 2)
Then follow these instructions to connect to the WebDAV server:
For XP and W3K:
1.) Navigate to My Network Places
2.) Select Add a network place
3.) Enter http://<server>:<port>/appstore/Forms
4.) When prompted enter the username and password of a user that has the roles of Adobe Administrative Console User and LiveCycle Form Manager Administrator.
5.) You will be prompted for the credentials once again then the add network wizard will display a panel letting you identify a name for the network place.
6.) Select Next
7.) Select the check box to open this connection and select finish.
8.) You have now a webdav connection to the root of the appstore and can publish forms directly to it.
You can then use this Network place directly from Designer to publish/edit forms in the appstore.