Why one tiny DLL file can stop an entire Windows program from launching

You can have a Windows program that eats up several gigabytes of storage, with thousands of files all sitting right where they belong, and it still won’t launch because one tiny DLL went missing. Windows doesn’t even give you a half-working window to poke around in. You double-click the EXE, an error pops up naming some obscure .dll file you’ve never heard of, and that’s it. Game over.

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