optimized settings file (Adobe Illustrator and Photoshop)
IRS is a data file format used by Adobe products. IRS files are common in both Adobe Illustrator and Adobe Photoshop programs. IRS files are used for saving optimized settings files for these applications. These files are an intricate part of these applications and are not meant to be opened or edited separately.
Learn more about .IRS files:
Search for .IRS-related questions on IT Knowledge Exchange.