Last Updated: January 25th, 2023
The majority of file (CYS) opening problems are caused by errors in the Windows Registry.
The Windows Registry is a directory which stores settings and options for Microsoft Windows operating systems. It contains information and settings for all the hardware, operating system software, most non-operating system software, and per-user settings.
Part of the Windows Registry holds the information for program shortcuts, similar to a phonebook. Over time, moving file locations, spyware / adware infections, or simply installing / uninstalling programs can create bad file path references.
This is the primary reason why your computer is not able to open certain file types - especially CYS and .DLL files - which are particularly vulnerable to Registry errors.
To repair Registry errors, you can open the Registry file yourself and make Registry repairs (not recommended unless you are PC technician). The other option is to use a Registry cleaning program which not only corrects problems, but it optimizes Windows performance.
Yes, you will probably see a major improvement in computer performance, especially if you've never checked your PC for Registry problems.
Your computer gets slower over time because system errors, corrupted files, and system infections makes Windows work harder to process information.
As a result, your system works at least 2-5x harder to process same amount of work than if your PC is problem-free.
After fixing these problems many users report that Windows performs like new again.
No. Using the recommended registry repair program will not interfere with your hard disk storage devices.
This includes external hard drivers, SD cards, memory cards, attached digital cameras, or any other storage device.
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