Serif PhotoPlus

PhotoPlus released by Serif was a Windows raster graphic editing software. PhotoPlus's native file format was .SPP. Serif replaced the software with the new Affinity software line which is incompatible with "Plus" formats.

Format Information
Early versions to around 2007 are based on the Microsoft Compound File format. Similar to the other Serif titles such as Serif PagePlus and DrawPlus.

File format was changed around 2007 to an XML based format. 

Links

 * Serif PhotoPlus | Wikipedia
 * Serif PhotoPlusX4 DVD
 * Serif PhotoPlus SE download
 * Sample Files