diff --git a/LEGO1/lego/sources/misc/legostorage.cpp b/LEGO1/lego/sources/misc/legostorage.cpp
index 7da93569..af4ecb8e 100644
--- a/LEGO1/lego/sources/misc/legostorage.cpp
+++ b/LEGO1/lego/sources/misc/legostorage.cpp
@@ -42,7 +42,7 @@ LegoFile::LegoFile()
 LegoFile::~LegoFile()
 {
 	if (m_file) {
-		fclose(m_file);
+		SDL_CloseIO(m_file);
 	}
 }
 
@@ -52,7 +52,7 @@ LegoResult LegoFile::Read(void* p_buffer, LegoU32 p_size)
 	if (!m_file) {
 		return FAILURE;
 	}
-	if (fread(p_buffer, 1, p_size, m_file) != p_size) {
+	if (SDL_ReadIO(m_file, p_buffer, p_size) != p_size) {
 		return FAILURE;
 	}
 	return SUCCESS;
@@ -64,7 +64,7 @@ LegoResult LegoFile::Write(const void* p_buffer, LegoU32 p_size)
 	if (!m_file) {
 		return FAILURE;
 	}
-	if (fwrite(p_buffer, 1, p_size, m_file) != p_size) {
+	if (SDL_WriteIO(m_file, p_buffer, p_size) != p_size) {
 		return FAILURE;
 	}
 	return SUCCESS;
@@ -76,7 +76,7 @@ LegoResult LegoFile::GetPosition(LegoU32& p_position)
 	if (!m_file) {
 		return FAILURE;
 	}
-	LegoU32 position = ftell(m_file);
+	Sint64 position = SDL_TellIO(m_file);
 	if (position == -1) {
 		return FAILURE;
 	}
@@ -90,7 +90,7 @@ LegoResult LegoFile::SetPosition(LegoU32 p_position)
 	if (!m_file) {
 		return FAILURE;
 	}
-	if (fseek(m_file, p_position, SEEK_SET) != 0) {
+	if (SDL_SeekIO(m_file, p_position, SDL_IO_SEEK_SET) != p_position) {
 		return FAILURE;
 	}
 	return SUCCESS;
@@ -100,7 +100,7 @@ LegoResult LegoFile::SetPosition(LegoU32 p_position)
 LegoResult LegoFile::Open(const char* p_name, LegoU32 p_mode)
 {
 	if (m_file) {
-		fclose(m_file);
+		SDL_CloseIO(m_file);
 	}
 	char mode[4];
 	mode[0] = '\0';
@@ -115,13 +115,15 @@ LegoResult LegoFile::Open(const char* p_name, LegoU32 p_mode)
 		strcat(mode, "w");
 	}
 	if ((p_mode & c_text) != 0) {
-		strcat(mode, "t");
 	}
 	else {
 		strcat(mode, "b");
 	}
 
-	if (!(m_file = fopen(p_name, mode))) {
+	MxString path(p_name);
+	path.NormalizePath();
+
+	if (!(m_file = SDL_IOFromFile(path.GetData(), mode))) {
 		return FAILURE;
 	}
 	return SUCCESS;
diff --git a/LEGO1/lego/sources/misc/legostorage.h b/LEGO1/lego/sources/misc/legostorage.h
index 5de72303..16cc976c 100644
--- a/LEGO1/lego/sources/misc/legostorage.h
+++ b/LEGO1/lego/sources/misc/legostorage.h
@@ -5,7 +5,7 @@
 #include "mxgeometry/mxgeometry3d.h"
 #include "mxstring.h"
 
-#include <stdio.h>
+#include <SDL3/SDL_iostream.h>
 
 // VTABLE: LEGO1 0x100d7d80
 // SIZE 0x08
@@ -149,7 +149,7 @@ class LegoFile : public LegoStorage {
 	// LegoFile::`scalar deleting destructor'
 
 protected:
-	FILE* m_file; // 0x08
+	SDL_IOStream* m_file; // 0x08
 };
 
 #endif // __LEGOSTORAGE_H
diff --git a/LEGO1/omni/include/mxstring.h b/LEGO1/omni/include/mxstring.h
index 79bab68c..ccaafbed 100644
--- a/LEGO1/omni/include/mxstring.h
+++ b/LEGO1/omni/include/mxstring.h
@@ -17,6 +17,7 @@ class MxString : public MxCore {
 	void Reverse();
 	void ToUpperCase();
 	void ToLowerCase();
+	void NormalizePath() { NormalizePath(m_data); }
 
 	MxString& operator=(const MxString& p_str);
 	const MxString& operator=(const char* p_str);
diff --git a/LEGO1/omni/src/common/mxutilities.cpp b/LEGO1/omni/src/common/mxutilities.cpp
index 9be9150c..7f3b3205 100644
--- a/LEGO1/omni/src/common/mxutilities.cpp
+++ b/LEGO1/omni/src/common/mxutilities.cpp
@@ -77,9 +77,6 @@ void MakeSourceName(char* p_output, const char* p_input)
 	if (extLoc) {
 		*extLoc = 0;
 	}
-
-	// [library:filesystem] Normalize this name since it will be part of a path.
-	MxString::NormalizePath(p_output);
 }
 
 // FUNCTION: LEGO1 0x100b7050
diff --git a/LEGO1/omni/src/stream/mxio.cpp b/LEGO1/omni/src/stream/mxio.cpp
index 60d927c2..dbc9a78d 100644
--- a/LEGO1/omni/src/stream/mxio.cpp
+++ b/LEGO1/omni/src/stream/mxio.cpp
@@ -1,6 +1,7 @@
 #include "mxio.h"
 
 #include "decomp.h"
+#include "mxstring.h"
 
 #include <assert.h>
 #include <limits.h>
@@ -40,9 +41,9 @@ MxU16 MXIOINFO::Open(const char* p_filename, MxULong p_flags)
 
 	m_info.lDiskOffset = m_info.lBufOffset = 0;
 
-	// DECOMP: Cast of p_flags to u16 forces the `movzx` instruction
-	// original: m_info.hmmio = OpenFile(p_filename, &unused, (MxU16) p_flags);
-	ASSIGN_M_FILE(SDL_IOFromFile(p_filename, "rb"));
+	MxString path(p_filename);
+	path.NormalizePath();
+	ASSIGN_M_FILE(SDL_IOFromFile(path.GetData(), "rb"));
 
 	if (M_FILE != NULL) {
 		m_info.dwFlags = p_flags;