.DLL File
What is it?
A DLL (Dynamic Link Library) is a file containing code and functions that Windows programs load and share at runtime, instead of every program bundling the same code separately.
How do I open it?
DLLs aren't meant to be opened directly — they're loaded automatically by the programs that need them. Opening one in a text editor shows unreadable binary data; developers use tools like a disassembler to inspect one.
Is it safe?
A genuine DLL from a trusted program is safe and necessary — Windows and your installed software need thousands of them to run. However, DLLs are also a common malware disguise, especially ones downloaded separately or placed in unexpected folders.
Can I delete it?
Don't delete a DLL unless you're certain which program installed it and that the program is being uninstalled too — removing one still in use will break that program with "missing DLL" errors. If antivirus flags a DLL as malicious, that's different: quarantine or remove it.