Based on the file naming convention, is a standard filename generated by Fujifilm digital cameras.

"DSCF" typically stands for "Digital Still Camera Fuji".

Are you asking about this specific image, or are you trying to identify the file format for a or software ? File:Shops, Oxton Road, Birkenhead - DSCF0055.JPG

It is frequently seen in online forum attachments, such as on Nissan Titan Forum or Honda Twins , as a generic filename, as shown here.

It represents the 55th picture in a sequence (often within a specific folder, such as 100_FUJI).