I don't know what the current official status of AIPD is, but the polymorphic "IMAQ Write File 2" VI which is in the LV palette does not offer AIPD in its selector. For me this means that there is no official support for AIPD anymore.
Unfortunately there is also no alternative for storing SGL or complex images.
My request: Add the AIPD format as an officially supported file format to "IMAQ Write File 2" or offer an appropriate alternative for all image types.
This is a good request. Until we have a more visible function for supporting these image types, you can use the old "vi.lib\vision\Files1.llb\IMAQ WriteFile" with AIPD specified as the File Type. You will be able to use the Read File VI on the palette to read it back.
Hope this helps,
Brad