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Getting Started - Developers
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See http://links.esri.com/flexviewer-gettingstarted-developers
1. In Flash Builder 4.5, Go to File Menu -> Import -> Flash Builder project.
2. Keeping "File" option selected, click "Browse..." button.
3. Select flexviewer-3.0Prerelease-src.zip downloaded in step 1, e.g. "C:\Documents and Settings\jack\My Documents\flexviewer-3.0Prerelease-src.zip".
4. "Extract new project to:" textbox will be automatically set to location where the project source will reside,
e.g. "C:\Documents and Settings\jack\Adobe Flash Builder 4\FlexViewer.
Do not put it onto your web server - you should separate your code location from your output.
5. Click "Finish" button. Project will be created and displayed in the Package Explorer window of Flash Builder 4, e.g. in this case FlexViewer.
How can you say that the sample files in viewer 3.0 is a widgetI said that because you made this statement
I open to view the MapSwitcher.mxml sample application in Adobe Flash Builder 4.6, copy and paste the Basic Route.mxml sample into the MapSwitcher.mxmlWell the MapSwitcher.mxml is ONE file of the whole Flex Viewer application that happens to be a uncompiled widget code file.
there is no .ai file extension like the flex 2.5 applicationI am not sure what you are saying here either as .ai files are the Adobe Illustrator file type?...