diff --git a/Core/NsfLoader.cpp b/Core/NsfLoader.cpp
index 55789efc..1a91185a 100644
--- a/Core/NsfLoader.cpp
+++ b/Core/NsfLoader.cpp
@@ -163,6 +163,9 @@ RomData NsfLoader::LoadRom(vector<uint8_t>& romFile)
 		romData.PrgRom.insert(romData.PrgRom.end(), 4096 - (romData.PrgRom.size() % 4096), 0);
 	}
 
+	//NSF header size
+	romData.Info.FilePrgOffset = 0x80;
+
 	InitializeFromHeader(romData);
 
 	return romData;
diff --git a/Core/NsfeLoader.h b/Core/NsfeLoader.h
index 04440862..f7f140c9 100644
--- a/Core/NsfeLoader.h
+++ b/Core/NsfeLoader.h
@@ -77,7 +77,7 @@ private:
 		return ss.str();
 	}
 
-	bool ReadChunk(uint8_t* &data, uint8_t* dataEnd, RomData& romData)
+	bool ReadChunk(uint8_t* &data, uint8_t* dataEnd, RomData& romData, uint8_t* fileStart)
 	{
 		if(data + 4 > dataEnd) {
 			return false;
@@ -110,6 +110,7 @@ private:
 			//Adjust to match NSF spec
 			header.StartingSong++;
 		} else if(fourCC.compare("DATA") == 0) {
+			romData.Info.FilePrgOffset = (int32_t)(data - fileStart);
 			//Pad start of file to make the first block start at a multiple of 4k
 			romData.PrgRom.insert(romData.PrgRom.end(), header.LoadAddress % 4096, 0);
 
@@ -189,6 +190,7 @@ public:
 
 		romData.Info.Format = RomFormat::Nsf;
 
+		uint8_t* fileStart = romFile.data();
 		uint8_t* data = romFile.data() + 4;
 		uint8_t* endOfData = romFile.data() + romFile.size();
 
@@ -198,7 +200,7 @@ public:
 
 		//Will be set to false when we read NEND block
 		romData.Error = true;
-		while(ReadChunk(data, endOfData, romData)) {
+		while(ReadChunk(data, endOfData, romData, fileStart)) {
 			//Read all chunks
 		}
 
diff --git a/Core/RomData.h b/Core/RomData.h
index aefcba28..caa0b5c6 100644
--- a/Core/RomData.h
+++ b/Core/RomData.h
@@ -69,6 +69,8 @@ struct RomInfo
 	bool IsInDatabase = false;
 	bool IsHeaderlessRom = false;
 
+	uint32_t FilePrgOffset = 0;
+
 	uint16_t MapperID = 0;
 	uint8_t SubMapperID = 0;
 	
diff --git a/Core/iNesLoader.cpp b/Core/iNesLoader.cpp
index 52d1bf48..4a93d9a5 100644
--- a/Core/iNesLoader.cpp
+++ b/Core/iNesLoader.cpp
@@ -25,6 +25,9 @@ RomData iNesLoader::LoadRom(vector<uint8_t>& romFile, NESHeader *preloadedHeader
 
 	romData.Info.Format = RomFormat::iNes;
 
+	//NSF header size
+	romData.Info.FilePrgOffset = sizeof(NESHeader);
+
 	romData.Info.IsNes20Header = (header.GetRomHeaderVersion() == RomHeaderVersion::Nes2_0);
 	romData.Info.MapperID = header.GetMapperID();
 	romData.Info.SubMapperID = header.GetSubMapper();
diff --git a/GUI.NET/Debugger/DbgImporter.cs b/GUI.NET/Debugger/DbgImporter.cs
index 5b9371f4..c77586e8 100644
--- a/GUI.NET/Debugger/DbgImporter.cs
+++ b/GUI.NET/Debugger/DbgImporter.cs
@@ -428,11 +428,8 @@ namespace Mesen.GUI.Debugger
 
 		public void Import(string path, bool silent = false)
 		{
-			if(InteropEmu.IsNsf()) {
-				_headerSize = 0x80;
-			} else {
-				_headerSize = 0x10;
-			}
+			RomInfo romInfo = InteropEmu.GetRomInfo();
+			_headerSize = (int)romInfo.FilePrgOffset;
 
 			string[] fileRows = File.ReadAllLines(path);
 
diff --git a/GUI.NET/InteropEmu.cs b/GUI.NET/InteropEmu.cs
index b009eeb2..66f31ca6 100644
--- a/GUI.NET/InteropEmu.cs
+++ b/GUI.NET/InteropEmu.cs
@@ -1670,6 +1670,7 @@ namespace Mesen.GUI
 		public bool IsChrRam;
 
 		public UInt16 MapperId;
+		public UInt32 FilePrgOffset;
 
 		[MarshalAs(UnmanagedType.ByValArray, SizeConst = 40)]
 		public byte[] Sha1;
@@ -1692,6 +1693,7 @@ namespace Mesen.GUI
 		public RomFormat Format;
 		public bool IsChrRam;
 		public UInt16 MapperId;
+		public UInt32 FilePrgOffset;
 		public string Sha1;
 
 		public RomInfo(InteropRomInfo romInfo)
@@ -1702,6 +1704,7 @@ namespace Mesen.GUI
 			this.Format = romInfo.Format;
 			this.IsChrRam = romInfo.IsChrRam;
 			this.MapperId = romInfo.MapperId;
+			this.FilePrgOffset = romInfo.FilePrgOffset;
 			this.Sha1 = Encoding.UTF8.GetString(romInfo.Sha1);
 		}
 
diff --git a/InteropDLL/ConsoleWrapper.cpp b/InteropDLL/ConsoleWrapper.cpp
index d947b7ad..2b15b958 100644
--- a/InteropDLL/ConsoleWrapper.cpp
+++ b/InteropDLL/ConsoleWrapper.cpp
@@ -112,6 +112,7 @@ namespace InteropEmu {
 		RomFormat Format;
 		bool IsChrRam;
 		uint16_t MapperId;
+		uint32_t FilePrgOffset;
 		char Sha1[40];
 	};
 
@@ -396,6 +397,7 @@ namespace InteropEmu {
 				interopRomInfo.Format = romInfo.Format;
 				interopRomInfo.IsChrRam = romInfo.HasChrRam;
 				interopRomInfo.MapperId = romInfo.MapperID;
+				interopRomInfo.FilePrgOffset = romInfo.FilePrgOffset;
 				if(romInfo.Hash.Sha1.size() == 40) {
 					memcpy(interopRomInfo.Sha1, romInfo.Hash.Sha1.c_str(), 40);
 				}
@@ -410,6 +412,7 @@ namespace InteropEmu {
 					interopRomInfo.PrgCrc32 = romData.Info.Hash.PrgCrc32;
 					interopRomInfo.Format = RomFormat::Unknown;
 					interopRomInfo.IsChrRam = romData.ChrRom.size() == 0;
+					interopRomInfo.FilePrgOffset = romData.Info.FilePrgOffset;
 					interopRomInfo.MapperId = 0;
 					if(romData.Info.Hash.Sha1.size() == 40) {
 						memcpy(interopRomInfo.Sha1, romData.Info.Hash.Sha1.c_str(), 40);
@@ -421,6 +424,7 @@ namespace InteropEmu {
 					interopRomInfo.PrgCrc32 = 0;
 					interopRomInfo.Format = RomFormat::Unknown;
 					interopRomInfo.IsChrRam = false;
+					interopRomInfo.FilePrgOffset = 0;
 					interopRomInfo.MapperId = 0;
 				}
 			}