diff --git a/src/gamedata.rs b/src/gamedata.rs
index 96e65d7..f4d4cf1 100755
--- a/src/gamedata.rs
+++ b/src/gamedata.rs
@@ -194,7 +194,7 @@ impl GameData {
     }
 
     /// Finds the offset inside of the DAT file for `path`.
-    pub fn find_offset(&mut self, path: &str) -> Option<u32> {
+    pub fn find_offset(&mut self, path: &str) -> Option<u64> {
         let slice = self.find_entry(path);
         match slice {
             Some((entry, chunk)) => {
diff --git a/src/index.rs b/src/index.rs
index 09b0060..71c4077 100755
--- a/src/index.rs
+++ b/src/index.rs
@@ -62,9 +62,9 @@ pub struct IndexHashTableEntry {
     #[bw(ignore)]
     pub data_file_id: u8,
 
-    #[br(calc = (data & !0xF) * 0x08)]
+    #[br(calc = (data & !0xF) as u64 * 0x08)]
     #[bw(ignore)]
-    pub offset: u32,
+    pub offset: u64,
 }
 
 // The only difference between index and index2 is how the path hash is stored.
@@ -87,16 +87,16 @@ pub struct Index2HashTableEntry {
     #[bw(ignore)]
     pub data_file_id: u8,
 
-    #[br(calc = (data & !0xF) * 0x08)]
+    #[br(calc = (data & !0xF) as u64 * 0x08)]
     #[bw(ignore)]
-    pub offset: u32,
+    pub offset: u64,
 }
 
 #[derive(Debug)]
 pub struct IndexEntry {
     pub hash: u64,
     pub data_file_id: u8,
-    pub offset: u32,
+    pub offset: u64,
 }
 
 #[binrw]