From Just Solve the File Format Problem
SPSS is a widely-used statistical package, developed and sold since 1968. Now owned by IBM, its official name is "IBM SPSS Statistics".
Four file formats are used by SPSS:
- SAV Binary "SPSS data format"
- SPO Output file - version 14
- SPS "Syntax file", plain text command script
- SPV Output file - version 17 and later
- IBM SPSS page
- Compatibility of SPSS files (.sav, .sps, .spv, .spo) between different versions (Technical support note, 2011-12-07)