diff --git a/core/deps/coreio/coreio.cpp b/core/deps/coreio/coreio.cpp
index 3c4522ff7..72e8a01f2 100644
--- a/core/deps/coreio/coreio.cpp
+++ b/core/deps/coreio/coreio.cpp
@@ -207,7 +207,7 @@ size_t core_fseek(core_file* fc, size_t offs, size_t origin) {
 		die("Invalid code path");
 
 	if (f->f)
-		fseek((FILE*)f, f->seek_ptr, SEEK_SET);
+		fseek(f->f, f->seek_ptr, SEEK_SET);
 
 	return 0;
 }
diff --git a/gdtool/gdtool.vcxproj b/gdtool/gdtool.vcxproj
index f48b31941..dd64e8c47 100644
--- a/gdtool/gdtool.vcxproj
+++ b/gdtool/gdtool.vcxproj
@@ -66,6 +66,7 @@
   <ItemGroup>
     <ClCompile Include="..\core\deps\chdpsr\cdipsr.cpp" />
     <ClCompile Include="..\core\deps\chdr\chdr.cpp" />
+    <ClCompile Include="..\core\deps\coreio\coreio.cpp" />
     <ClCompile Include="..\core\deps\crypto\md5.cpp" />
     <ClCompile Include="..\core\deps\crypto\sha1.cpp" />
     <ClCompile Include="..\core\deps\libpng\png.c" />
@@ -110,6 +111,7 @@
     <ClInclude Include="..\core\deps\chdpsr\cdipsr.h" />
     <ClInclude Include="..\core\deps\chdr\chd.h" />
     <ClInclude Include="..\core\deps\chdr\coretypes.h" />
+    <ClInclude Include="..\core\deps\coreio\coreio.h" />
     <ClInclude Include="..\core\deps\crypto\md5.h" />
     <ClInclude Include="..\core\deps\crypto\sha1.h" />
     <ClInclude Include="..\core\deps\libpng\config.h" />
diff --git a/gdtool/gdtool.vcxproj.filters b/gdtool/gdtool.vcxproj.filters
index 4b1fafb3b..185d360e5 100644
--- a/gdtool/gdtool.vcxproj.filters
+++ b/gdtool/gdtool.vcxproj.filters
@@ -115,6 +115,9 @@
     <ClCompile Include="src\cdromfs.cpp">
       <Filter>src</Filter>
     </ClCompile>
+    <ClCompile Include="..\core\deps\coreio\coreio.cpp">
+      <Filter>deps\coreio</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\core\imgread\SCSIDEFS.H">
@@ -195,6 +198,9 @@
     <ClInclude Include="src\cdromfs_imp.h">
       <Filter>src</Filter>
     </ClInclude>
+    <ClInclude Include="..\core\deps\coreio\coreio.h">
+      <Filter>deps\coreio</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Filter Include="imgread">
@@ -221,5 +227,8 @@
     <Filter Include="deps\crypto">
       <UniqueIdentifier>{a78ba9fb-70ba-4319-89e7-926abca0794c}</UniqueIdentifier>
     </Filter>
+    <Filter Include="deps\coreio">
+      <UniqueIdentifier>{cac3d6da-3b7f-47ae-89be-59803c990f41}</UniqueIdentifier>
+    </Filter>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/gdtool/gdtool.vcxproj.user b/gdtool/gdtool.vcxproj.user
index b14130af6..55c962ba8 100644
--- a/gdtool/gdtool.vcxproj.user
+++ b/gdtool/gdtool.vcxproj.user
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
-    <LocalDebuggerCommandArguments>c:\ika.chd</LocalDebuggerCommandArguments>
+    <LocalDebuggerCommandArguments>q:\ika.chd</LocalDebuggerCommandArguments>
     <DebuggerFlavor>WindowsLocalDebugger</DebuggerFlavor>
   </PropertyGroup>
 </Project>
\ No newline at end of file
diff --git a/gdtool/src/main.cpp b/gdtool/src/main.cpp
index eca004055..7311249a1 100644
--- a/gdtool/src/main.cpp
+++ b/gdtool/src/main.cpp
@@ -181,6 +181,10 @@ void extract_data(FILE* w, bool first, Disc* d, int start_fad, int size) {
 	}
 }
 
+void hash_track() {
+
+}
+
 bool jsarray;
 vector<string> cmds;
 vector<string> files;
@@ -201,9 +205,17 @@ void exec_cmd(FILE* w, bool first,  Disc* d) {
 			}
 			break;
 
-		case 'i':
-			extract_info(w, first, d);
-			break;
+			case 'i':
+				extract_info(w, first, d);
+				break;
+
+			case 'h':
+				printf("hashes not supported yet");
+				break;
+
+			case 'f':
+				printf("fingerprint not supported yet");
+				break;
 		}
 	}
 }
@@ -238,27 +250,23 @@ void parse_args(int argc, char** argv) {
 
 		if (p[0][0] == '-') 
 		{
-			i++;
+			auto cmd = string(p[0]);
 
-			switch(p[0][1]) {
-			
-			case 'G':
-			case 'g':
+			if (cmd == "-get") {
 				cmds.push_back("g");
 				cmds.push_back(p[1]);
 				cmds.push_back(p[2]);
 				i+=2;
 				break;
-			
-			case 'I':
-			case 'i':
+			} else if (cmd == "-info") {
 				cmds.push_back("i");
-				break;
-
-			default:
-				printf("Unknown option %c\n",*p[1]);
+			} else if (cmd == "-hash") {
+				cmds.push_back("h");
+			} else if (cmd == "-fingerprint") {
+				cmds.push_back("f");
+			} else {
+				printf("Unknown option %s\n", cmd.c_str());
 			}
-
 		}
 		else
 			files.push_back(p[0]);