All formats supported by WIC (Windows Imaging Component) are available.

Extensions *.dds,*.wdp, *.jxr, *.hdp, *.heic, *.heif, *.heics, *.avcs, *.heifs, *.webp

WIC (Windows Imaging Component) is a Windows API that provides access to fast Windows methods for loading and saving images.

WIC is used by Advanced TIFF Editor (Advanced TIFF Editor Plus) to support HDP, DDS, HEIF and WebP. It can optionally be used to load other formats such as JPEG, PNG, GIF, etc.

To support some WIC formats (such as HEIF and WebP) you will need to install a codec from the Microsoft Store.

More Info:
https://docs.microsoft.com/en-gb/windows/desktop/wic/native-wic-codecs

HEIF/HEIC loading is supported if the Windows drivers are available on the system.

Generally you need to install "HEVC Video Extensions from the Device Manufacturer":

https://www.microsoft.com/en-au/p/hevc-video-extensions-from-device-manufacturer/9n4wgh0z6vhq

And on older systems you may also need "HEIF Image Extensions":

https://www.microsoft.com/en-au/p/heif-image-extensions/9pmmsr1cgpwg

Both are free on the Microsoft Store.

More information about programs:

Able Fax Tif View

Able Batch Image Converter

Able Photo Slideshow