Files with the .sp3 extension contain Quake 2 Sprite Builder files. These files contain sprites that can be loaded in the Quake 2 gaming application. The SP3 files are stored in the PCX file format, allowing the files to take up less disk space without compromising the quality of the file.
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If you have additional information about the SP3 file format or software that uses files with the SP3 suffix, please do get in touch - we would love hearing from you.