Images with "*.jpeg" extension are saved as "*.jpg" in a different file even if the "Overwrite" option is checked. 

Steps to reproduce:

1. Open an image with "*.jpeg" extension in ImageEditor (e.g. test.JPEG)
2. Edit the image
3. Open the Save Dialog and choose "Save Image On Server" with checked "Overwrite if file exists?" option

Result: The edited image is saved as a new files with jpg extension (e.g. test.jpg)