Missing software and file drivers is often a leading cause of CLS file problems. It is highly recommended that you scan your PC using the CLS File Repair Tool. It will analyze your files and make sure you have the necessary file openers.
CLS file error symptoms can include the inability to open CLS files, program lock-ups, crashes, slow PC performance, startup and shut down problems, and installation errors.
Fixing the Problem
To ensure CLS files can be opened and read by your computer, download and run the CLS File Repair Tool. Simply click the button below to download the software.