Some versions of isarcextract.dll are self-registering COM components. After placing the file in the correct directory, you may need to register it manually.
Steps to register:
To unregister (if troubleshooting), use:
regsvr32 /u isarcextract.dll
A: No. This is a niche extraction library, not a performance driver.
A: You need administrator privileges. Right-click File Explorer or your command prompt and select Run as administrator. Also, ensure no program is currently using the DLL (close the associated software).