The .ols file extension is most commonly used by Microsoft Office software applications. The OLS files contain list shortcut files that are used with Microsoft Office programs.
Try a universal file viewer
File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.
If you have additional information about the OLS file format or software that uses files with the OLS suffix, please do get in touch - we would love hearing from you.