Mike Jones just publish an article on Reconnecting Flex Builder Plug-in To Eclipse—which shows how to move an installation of your Flex Builder Plug-in to a new installation of Eclipse without having to uninstall/install. His instructions are for Mac OSX, but it looks as if they might be virtually the same for windows.
Below are Mike's original instructions.
- Install a fresh copy of eclipse, but don't delete the old version yet. (I called mine eclipse-new, you can rename it at the end)
- Copy start_fb.jar to the root of your new eclipse installation
- Copy the Flex Builder link file com.adobe.flexbuilder.feature.core.osx.link to the "links" folder in the root of your new eclipse installation (If you are using Ganymede - 3.4 or greater you'll need to create this folder)
- Open up the bundles.info file located in you old eclipse installation/configuration/org.eclipse.equinox.simpleconfigurator in a text editor
- Copy all of the Flex Builder related entries - use the file reference as a guide as not all of the packages have Flex in the name
- Now open up the same file, but in your new installation and paste those entries at the top and save it
- Start up your new clean eclipse install and bask in your 1337 s1<i||z :p
- If all went to plan you can now close eclipse, delete the old version and rename the new one - job done.
While I haven't tested this, it looks like this should work in Windows with the exception being the "link" file is actually named com.adobe.flexbuilder.feature.core.link in Windows.