hi,
the AEE files are XML files related to the edits you did to your photos while they were in the iphone. This is what you see inside the AEE file if you open it with a text editor.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>adjustmentBaseVersion</key>
<integer>0</integer>
<key>adjustmentData</key>
<data>
YnBsaXN0MDDRAQJac2xvd01vdGlvbtIDBAUWV3JlZ2lvbnNUcmF0ZaEG0QcIWXRpbWVS
YW5nZdIJCgsUVXN0YXJ0WGR1cmF0aW9u1AwNDg8QERITVWZsYWdzVXZhbHVlWXRpbWVz
Y2FsZVVlcG9jaBABEkNSzWASO5rKABAA1AwNDg8QFRITEwAAAAE6LRPAIj4AAAAICxYb
IygqLTc8QktUWmBqcHJ3fH6HkAAAAAAAAAEBAAAAAAAAABcAAAAAAAAAAAAAAAAAAACV
</data>
<key>adjustmentEditorBundleID</key>
<string></string>
<key>adjustmentFormatIdentifier</key>
<string>com.apple.video.slomo</string>
<key>adjustmentFormatVersion</key>
<string>1.1</string>
</dict>
</plist>
Unfortunately ( in my case ??) Aperture in Yosemite can not read these files and all edits are gone when importing your photos. Did you notice your iphone edits are gone in all synced photos? When you import and sync photo folders or events via itunes you won't see anymore any changes you did to your photos in your iphone.