Our website provides a free download of IRTPRO for Windows 3.0. The program is included in Office Tools. The actual developer of the software is SSI. The most popular version of the software is 2.1.
From the developer:
IRTPRO imports data from a variety of statistical software packages as well as importing data from fixed format data (.fixed), comma-separated (.csv), tab-delimited (usually .txt), and Excel (.xls) files. Whatever the original format, the imported data are saved to an IRTPRO data file with extension .ssig that is displayed visually as a spreadsheet, similar in appearance to an Excel spreadsheet.
You may want to check out more software, such as Windows Data Recovery Utility, Window Hide Tool or Windows 8 Transformation Pack, which might be related to IRTPRO for Windows.
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