PixBuilder Studio offers you three ways to save a file: Save, Save As, and Save With Preview.
"Save" is only available if the image has been changed. The extension of the saved file will remain the same. If the image is new, "Save" will operate as "Save As".
"Save As" offers the chance to choose the format of a file you want to obtain and set the saving parameters.
"Save With Preview" is only available for images with resolution less than ten megapixels. If the resolution is higher, "Save With Preview" will operate as "Save As".
The dialog has a preview option.