2011-03-24

Error 800B0003 - The form specified for the subject is not one supported or known by the specified trust provider

You're trying to digitally sign a file, aren't you?
And until this post, you weren't aware that only a specific set of files, such as executables, DLLs or cat files could be signed on Windows, but that random blurb, such as text files couldn't.

Well, now you know. If you see this error, it simply means that Windows does not recognize the input file as something it is able to affix a digital signature on.

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