.SP File Extension

Data file created by Simplexety, an advanced calculator program used for creating and evaluating mathematical functions as well as creating graphs; saves the list of functions and data and also supports storage of custom VBScript source code; can be used for storing and sharing mathematical data with others.

When you save an SP file, an .SY file is also saved alongside. You can use either the SP or SY file to reopen content in Simplexety.

UK traffic sign designed with SingPlot, a sign creation program for designing traffic signs for use within the United Kingdom; automates the layout and spacing rules of the DfT Traffic Signs Regulations; contains vector images and text that can be printed in large sizes without losing quality.

An SP file may also be an update file that is part of Windows XP Service Pack 1 (SP1). It contains data used to update, fix, and enhance Windows XP. SP files use the filenames WIN51IP.SP and WIN51IC.SP.

Before PCs and operating systems were regularly updated over the Internet, they were updated using physical CD-ROMs. Windows XP updates were stored on Windows XP Service Pack CDs. These CDs contained a number of files and folders, including a data file used to apply fixes and enhancements to a user's copy of Windows XP. On the Windows XP Service Pack 1 disc, that file was named WIN51IP.SP (Windows XP SP1 Professional Edition) or WIN51IC.SP (Windows XP SP1 Home Edition).

Microsoft released Windows XP Service Pack 1 on September 9, 2002. It was most notable for adding the Set Programs Access and Defaults page to Windows XP, which allowed users to change the default programs used for activities such as accessing the Internet and playing media files.

SP files are not meant to be opened. If you still possess a copy of Windows XP Service Pack 1, you can use the disc to apply the fixes and enhancements its SP file contains to Windows XP. To do so, insert the disc into your CD-ROM drive, browse to the disc in File Explorer, and double-click SETUP.EXE.