The .jpg_56x42 file extension is very much related to bitmap image files. The said file extension is frequently found on pictures and images taken and saved using Android based smartphones like Samsung Galaxy S and Sony smartphone series. The .jpg_56x42 files are in two parts. The first one is the '.jpeg' part. It indicates that the file is a standard picture file. JPEG or JPG files are found in many pictures generated by numerous devices. The second one is the 56x42 part. It refers to the pixel of the image and tells exactly the size of the file.
Since it is an image file, typical image viewer and editor can be used to read the .jpg_56x42 files. However, when the files came from the internet, make sure to scan them first before opening it. These files are sometimes considered to be encrypted files and encrypted files are quite suspicious and/ or dangerous if not properly treated. Make sure to know the safety first policies in opening an unknown file type before starting anything.
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If you have additional information about the JPG_56X42 file format or software that uses files with the JPG_56X42 suffix, please do get in touch - we would love hearing from you.