In regards to the unencrypted ExeFS in the recently released homebrew .CXI by Xcution, below are the offsets of the contents of the ExeFS for those who want to slice it up.
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The contents of the ExeFS with Offsets and sizes.
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{| class="wikitable" border="1"
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|-
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! OFFSET
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! SIZE
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! DESCRIPTION
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|-
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| 0x00
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| 0x200
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| Header
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|-
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| 0x200
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| 0x?
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| Code
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|-
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| 0x5C00
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| 0x4E20
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| Banner (when extracted the official extention is .bnr)
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|-
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| 0xAC00
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| 0x3800
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| Icon (when extracted the official extention is .icn)