diff --git a/lib/nx/AciHeader.cpp b/lib/nx/AciHeader.cpp
new file mode 100644
index 0000000..ae54d56
--- /dev/null
+++ b/lib/nx/AciHeader.cpp
@@ -0,0 +1,142 @@
+#include "AciHeader.h"
+
+void AciHeader::clearVariables()
+{
+	mType = TYPE_ACI0;
+	mProgramId = 0;
+	mFac.offset = 0;
+	mFac.size = 0;
+	mSac.offset = 0;
+	mSac.size = 0;
+	mKc.offset = 0;
+	mKc.size = 0;
+}
+
+void AciHeader::calculateSectionOffsets()
+{
+	mFac.offset = align(sizeof(sAciHeader), kAciAlignSize);
+	mSac.offset = mFac.offset + align(mFac.size, kAciAlignSize);
+	mKc.offset = mSac.offset + align(mSac.size, kAciAlignSize);
+}
+
+const u8 * AciHeader::getBytes() const
+{
+	return mBinaryBlob.data();
+}
+
+size_t AciHeader::getSize() const
+{
+	return mBinaryBlob.size();
+}
+
+void AciHeader::exportBinary()
+{
+	mBinaryBlob.alloc(sizeof(sAciHeader));
+	sAciHeader* hdr = (sAciHeader*)mBinaryBlob.data();
+
+	// set type
+	switch (mType)
+	{
+	case (TYPE_ACI0):
+		hdr->set_signature(kAciStructSig.c_str());
+		break;
+	case (TYPE_ACID):
+		hdr->set_signature(kAciDescStructSig.c_str());
+		break;
+	default:
+		throw fnd::Exception(kModuleName, "Unexpected ACI type");
+	}
+
+	// set program
+	hdr->set_program_id(mProgramId);
+
+	// set offset/size
+	calculateSectionOffsets();
+	hdr->fac().set_offset(mFac.offset);
+	hdr->fac().set_size(mFac.size);
+	hdr->sac().set_offset(mSac.offset);
+	hdr->sac().set_size(mSac.size);
+	hdr->kc().set_offset(mKc.offset);
+	hdr->kc().set_size(mKc.size);
+}
+
+void AciHeader::importBinary(const u8 * bytes)
+{
+	clearVariables();
+
+	mBinaryBlob.alloc(sizeof(sAciHeader));
+	memcpy(mBinaryBlob.data(), bytes, sizeof(sAciHeader));
+
+	sAciHeader* hdr = (sAciHeader*)mBinaryBlob.data();
+
+	if (memcmp(hdr->signature(), kAciStructSig.c_str(), 4) == 0)
+	{
+		mType = TYPE_ACI0;
+	}
+	else if (memcmp(hdr->signature(), kAciDescStructSig.c_str(), 4) == 0)
+	{
+		mType = TYPE_ACID;
+	}
+	else
+	{
+		throw fnd::Exception(kModuleName, "ACI header corrupt");
+	}
+
+	mProgramId = hdr->program_id();
+	mFac.offset = hdr->fac().offset();
+	mFac.size = hdr->fac().size();
+	mSac.offset = hdr->sac().offset();
+	mSac.size = hdr->sac().size();
+	mKc.offset = hdr->kc().offset();
+	mKc.size = hdr->kc().size();
+}
+
+AciHeader::AciType AciHeader::getAciType() const
+{
+	return mType;
+}
+
+void AciHeader::setAciType(AciType type)
+{
+	mType = type;
+}
+
+u64 AciHeader::getProgramId() const
+{
+	return mProgramId;
+}
+
+void AciHeader::setProgramId(u64 program_id)
+{
+	mProgramId = program_id;
+}
+
+const AciHeader::sSection & AciHeader::getFileAccessControl() const
+{
+	return mFac;
+}
+
+void AciHeader::setFileAccessControl(u32 size)
+{
+	mFac.size = size;
+}
+
+const AciHeader::sSection & AciHeader::getServiceAccessControl() const
+{
+	return mSac;
+}
+
+void AciHeader::setServiceAccessControl(u32 size)
+{
+	mSac.size = size;
+}
+
+const AciHeader::sSection & AciHeader::getKernelCapabilities() const
+{
+	return mKc;
+}
+
+void AciHeader::setKernelCapabilities(u32 size)
+{
+	mKc.size = size;
+}
diff --git a/lib/nx/AciHeader.h b/lib/nx/AciHeader.h
new file mode 100644
index 0000000..101baac
--- /dev/null
+++ b/lib/nx/AciHeader.h
@@ -0,0 +1,97 @@
+#pragma once
+#include <fnd/types.h>
+#include <fnd/memory_blob.h>
+#include <string>
+
+class AciHeader
+{
+public:
+	enum AciType
+	{
+		TYPE_ACI0,	// for Access Control Info
+		TYPE_ACID	// for Access Control Info Desc
+	};
+
+	struct sSection
+	{
+		size_t offset;
+		size_t size;
+	};
+
+	// to be used after export
+	const u8* getBytes() const;
+	size_t getSize() const;
+
+	// export/import binary
+	void exportBinary();
+	void importBinary(const u8* bytes);
+
+	// variables
+	AciType getAciType() const;
+	void setAciType(AciType type);
+	u64 getProgramId() const;
+	void setProgramId(u64 program_id);
+	const sSection& getFileAccessControl() const;
+	void setFileAccessControl(u32 size);
+	const sSection& getServiceAccessControl() const;
+	void setServiceAccessControl(u32 size);
+	const sSection& getKernelCapabilities() const;
+	void setKernelCapabilities(u32 size);
+
+private:
+	const std::string kModuleName = "ACI_HEADER";
+	const std::string kAciStructSig = "ACI0";
+	const std::string kAciDescStructSig = "ACID";
+	static const size_t kAciAlignSize = 0x10;
+
+#pragma pack(push, 1)
+	struct sAciHeader
+	{
+	private:
+		u8 signature_[4];
+		u8 reserved_1[12];
+		u64 program_id_;
+		u8 reserved_2[8];
+		struct sAciSection
+		{
+		private:
+			u32 offset_; // aligned by 0x10 from the last one
+			u32 size_;
+		public:
+			u32 offset() const { return le_word(offset_); }
+			void set_offset(u32 offset) { offset_ = le_word(offset); }
+
+			u32 size() const { return le_word(size_); }
+			void set_size(u32 size) { size_ = le_word(size); }
+		} fac_, sac_, kc_;
+		u8 reserved_3[8];
+	public:
+		const char* signature() const { return (const char*)signature_; }
+		void set_signature(const char* signature) { memcpy(signature_, signature, 4); }
+
+		u64 program_id() const { return le_dword(program_id_); }
+		void set_program_id(u64 program_id) { program_id_ = le_dword(program_id); }
+
+		const sAciSection& fac() const { return fac_; }
+		sAciSection& fac() { return fac_; }
+
+		const sAciSection& sac() const { return sac_; }
+		sAciSection& sac() { return sac_; }
+
+		const sAciSection& kc() const { return kc_; }
+		sAciSection& kc() { return kc_; }
+	};
+#pragma pack(pop)
+
+	// raw data
+	fnd::MemoryBlob mBinaryBlob;
+
+	// variables
+	AciType mType;
+	u64 mProgramId;
+	sSection mFac, mSac, mKc;
+
+	void clearVariables();
+	void calculateSectionOffsets();
+};
+
diff --git a/lib/nx/nx.vcxproj b/lib/nx/nx.vcxproj
index d525d0f..0969761 100644
--- a/lib/nx/nx.vcxproj
+++ b/lib/nx/nx.vcxproj
@@ -19,10 +19,12 @@
     </ProjectConfiguration>
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="AciHeader.h" />
     <ClInclude Include="NcaHeader.h" />
     <ClInclude Include="NXCrypto.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="AciHeader.cpp" />
     <ClCompile Include="NcaHeader.cpp" />
   </ItemGroup>
   <PropertyGroup Label="Globals">
@@ -83,6 +85,7 @@
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
       <SDLCheck>true</SDLCheck>
+      <AdditionalIncludeDirectories>..\</AdditionalIncludeDirectories>
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
@@ -90,6 +93,7 @@
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
       <SDLCheck>true</SDLCheck>
+      <AdditionalIncludeDirectories>..\</AdditionalIncludeDirectories>
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
diff --git a/lib/nx/nx.vcxproj.filters b/lib/nx/nx.vcxproj.filters
index 8885ede..a1a9994 100644
--- a/lib/nx/nx.vcxproj.filters
+++ b/lib/nx/nx.vcxproj.filters
@@ -21,10 +21,16 @@
     <ClInclude Include="NcaHeader.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="AciHeader.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="NcaHeader.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="AciHeader.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>
\ No newline at end of file