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Characteristicsfield is set. Although DLLs expose tend to expose functions that an executable would not, I believe that both a PE and ELF can be executable in their own right, regardless..so) that's usable as a library and also has its own_startentry point so is also executable. The fact that ELF supported that used to just be a silly computer trick, but was used as the basis for PIE executables to enable ASLR of static storage (.text/.rodata/.data/.bss). These daysfileknows to call it a PIE executable, but for years it would just say "shared object". It's still not normal for the same file to actually be used as a.soand an executable; the use-case would probably be for a library to have self-tests compiled in.