DLL files are a type of file that contains code and data used by multiple programs to perform various functions. In the case of Adobe Photoshop CS6, these files are essential for the software to run correctly, as they contain important code and resources.
No. These files are often version-mismatched, infected with trojans, or designed for pirated copies. Always use original Adobe sources.
If you own a legitimate license: The fixes above take 10 minutes. CS6 is still perfectly functional for 90% of design tasks.