.SP4 File Extension
SuperCard 4 Player Project
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What is an SP4 file?
Data file used by SuperCard Player, an application used to execute SuperCard data documents (.SC4 files); may contain one or more standalone applications, presentations, user interfaces, and other programs.
The SuperCard 4 Player project file has the same format as the SuperCard 4 project file, however it is associated with the SuperCard Player application by default. SP4 files are not as popular as SC4 files.
NOTE: SP4 files were replaced .SP45 files with the release of SuperCard Player version 4.5.