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PWP file format
The Seattle Film works is an image format made by the PhotoWorks software designed for disseminating graphic information on the internet. It has a close resemblance to JPEG in terms of structure. Also, it can undergo conversion without losing quality and can store several SFW images.
This is a rather obsolete and rare image formatting file. It is made by Seattle FilmWorks, a company into mail order processing but later became PhotoWorks Similar file formats are SFM, PWM, and ALB. They do not open outside the software used in creating them, so it is recommended they are converted to JPEG or other flexible extensions.