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jtippet edited this page Mar 23, 2019 · 2 revisions

ICO100: InvalidIcoHeader_idReserved

The ICO file header has a field named ICONDIR::idReserved. This field must contain the value 0. If it does not contain 0, it is probably not actually an ICO file.

The most likely cause of this is that you gave some other type of file, like a .PNG or .PDF, where an .ICO was expected.

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