The .spp file extension is most commonly used by the PhotoPlus software application. When a user edits an image with the PhotoPlus program, the picture is saved in the SPP file format. The SPP file format is similar to the Adobe Photoshop PSD file format, but SPP files are created with PhotoPlus and not Photoshop.
The .spp file extension is also used for Sprint printer files, NMS-Edit files, Scrapbook Factory files, PowerPoint sealed presentation files and SPSS files.
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If you have additional information about the SPP file format or software that uses files with the SPP suffix, please do get in touch - we would love hearing from you.