This release includes the headers (include/), MinGW libraries, and OpenSSL DLLs (libcrypto-3.dll and libssl-3.dll).
libcrypto-3.dll was patched to remove imports to _strtoi64 and _strtoui64. The unpatched version is called libcrypto-3-original.dll, but if you decide to use it, keep in mind that Windows 2000 and lower don't provide these imports and therefore the DLL won't work.