diff --git a/config/SOUE01/splits.txt b/config/SOUE01/splits.txt
index 8b4cd82f..0fa415b5 100644
--- a/config/SOUE01/splits.txt
+++ b/config/SOUE01/splits.txt
@@ -173,6 +173,9 @@ nw4r/ut/ut_list.cpp:
 nw4r/ut/ut_LinkList.cpp:
 	.text       start:0x8042A850 end:0x8042A9E0
 
+nw4r/ut/ut_binaryFileFormat.cpp:
+	.text       start:0x8042A9E0 end:0x8042AA54
+
 nw4r/db/db_directPrint.cpp:
 	.text       start:0x804342A0 end:0x80434E9C
 	.rodata     start:0x804F5D28 end:0x804F5FDC
diff --git a/config/SOUE01/symbols.txt b/config/SOUE01/symbols.txt
index 39171bc6..78caaed3 100644
--- a/config/SOUE01/symbols.txt
+++ b/config/SOUE01/symbols.txt
@@ -23939,7 +23939,7 @@ Erase__Q44nw4r2ut6detail12LinkListImplFQ54nw4r2ut6detail12LinkListImpl8Iterator
 Clear__Q44nw4r2ut6detail12LinkListImplFv = .text:0x8042A930; // type:function size:0x44
 Insert__Q44nw4r2ut6detail12LinkListImplFQ54nw4r2ut6detail12LinkListImpl8IteratorPQ34nw4r2ut12LinkListNode = .text:0x8042A980; // type:function size:0x2C
 Erase__Q44nw4r2ut6detail12LinkListImplFPQ34nw4r2ut12LinkListNode = .text:0x8042A9B0; // type:function size:0x30
-fn_8042A9E0 = .text:0x8042A9E0; // type:function size:0x74
+IsValidBinaryFile__Q24nw4r2utFPCQ34nw4r2ut16BinaryFileHeaderUlUsUs = .text:0x8042A9E0; // type:function size:0x74
 fn_8042AA60 = .text:0x8042AA60; // type:function size:0x78
 fn_8042AAE0 = .text:0x8042AAE0; // type:function size:0x1C
 fn_8042AB00 = .text:0x8042AB00; // type:function size:0x1C
diff --git a/configure.py b/configure.py
index 075220c3..3563baa5 100644
--- a/configure.py
+++ b/configure.py
@@ -319,6 +319,7 @@ config.libs = [
         [
             Object(Matching, "nw4r/ut/ut_list.cpp"),
             Object(Matching, "nw4r/ut/ut_LinkList.cpp"),
+            Object(Matching, "nw4r/ut/ut_binaryFileFormat.cpp"),
         ],
     ),
     # EGG
diff --git a/include/nw4r/ut/ut_binaryFileFormat.h b/include/nw4r/ut/ut_binaryFileFormat.h
index eeb5faca..8185fc24 100644
--- a/include/nw4r/ut/ut_binaryFileFormat.h
+++ b/include/nw4r/ut/ut_binaryFileFormat.h
@@ -19,8 +19,7 @@ struct BinaryFileHeader {
     u16 numBlocks;  // at 0xE
 };
 
-bool IsValidBinaryFile(const BinaryFileHeader* header, u32 magic, u16 version,
-                       u16 numBlocks);
+bool IsValidBinaryFile(const BinaryFileHeader *header, unsigned long magic, u16 version, u16 numBlocks);
 
 } // namespace ut
 } // namespace nw4r
diff --git a/src/nw4r/ut/ut_binaryFileFormat.cpp b/src/nw4r/ut/ut_binaryFileFormat.cpp
new file mode 100644
index 00000000..1b62b51c
--- /dev/null
+++ b/src/nw4r/ut/ut_binaryFileFormat.cpp
@@ -0,0 +1,28 @@
+#include <nw4r/ut/ut_binaryFileFormat.h>
+
+namespace nw4r {
+namespace ut {
+
+/* 8042a9e0 */
+bool IsValidBinaryFile(const BinaryFileHeader *header, unsigned long magic, u16 version, u16 numBlocks) {
+    if (header->magic != magic) {
+        return false;
+    }
+    if (header->byteOrder != 0xFEFF) {
+        return false;
+    }
+    if (header->version != version) {
+        return false;
+    }
+    if (header->fileSize < (numBlocks * sizeof(BinaryBlockHeader) + sizeof(BinaryFileHeader))) {
+        return false;
+    }
+
+    if (header->numBlocks < numBlocks) {
+        return false;
+    }
+    return true;
+}
+
+} // namespace ut
+} // namespace nw4r