diff --git a/src/main/java/com/dostalgia/UploadResource.java b/src/main/java/com/dostalgia/UploadResource.java
index c170c36..e3a18ce 100644
--- a/src/main/java/com/dostalgia/UploadResource.java
+++ b/src/main/java/com/dostalgia/UploadResource.java
@@ -391,7 +391,7 @@ public class UploadResource {
 
     /** File extensions that DOSBox can mount as CD-ROM via imgmount. */
     private static final java.util.Set<String> CD_EXT = java.util.Set.of(
-        ".iso", ".cue", ".img", ".ccd"
+        ".iso", ".cue", ".img", ".ccd", ".bin"
     );
 
     /** Find mountable CD image files in the extracted game directory.
@@ -584,10 +584,30 @@ public class UploadResource {
         sb.append("[autoexec]\n");
         sb.append("@echo off\n");
         sb.append("mount c .\n");
-        // Mount CD images as D:, E:, … so games can find their CD
+        // Mount CD images as D:, E:, … so games can find their CD.
+        // Prefer .bin over .cue from the same directory to avoid case-mismatch
+        // between the .cue's internal FILE reference and the actual filename.
+        // .bin files are mounted with -fs iso for direct filesystem access.
+        Set<String> seenDirs = new java.util.HashSet<>();
         char driveLetter = 'D';
         for (String img : cdImages) {
-            sb.append("imgmount ").append(driveLetter).append(" \"").append(img).append("\" -t cdrom\n");
+            // Deduplicate by directory — prefer .bin over .cue
+            int slashIdx = img.lastIndexOf('/');
+            String parentDir = slashIdx >= 0 ? img.substring(0, slashIdx) : "";
+            String imgLower = img.toLowerCase();
+            if (seenDirs.contains(parentDir)) continue;
+            if (imgLower.endsWith(".cue")) {
+                // Check if a .bin exists in the same directory
+                boolean hasBin = cdImages.stream().anyMatch(i -> {
+                    int is = i.lastIndexOf('/');
+                    String ip = is >= 0 ? i.substring(0, is) : "";
+                    return ip.equals(parentDir) && i.toLowerCase().endsWith(".bin");
+                });
+                if (hasBin) continue; // .bin will be mounted instead (lower in list)
+            }
+            seenDirs.add(parentDir);
+            String flags = imgLower.endsWith(".bin") ? " -t cdrom -fs iso" : " -t cdrom";
+            sb.append("imgmount ").append(driveLetter).append(" \"").append(img).append("\"").append(flags).append("\n");
             driveLetter++;
         }
         sb.append("c:\n");