diff --git a/src/cdrom/cdrom_image_backend.c b/src/cdrom/cdrom_image_backend.c
index 1c5a87821..19968fe2b 100644
--- a/src/cdrom/cdrom_image_backend.c
+++ b/src/cdrom/cdrom_image_backend.c
@@ -25,8 +25,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/stat.h>
 #ifdef _WIN32
 #    include <string.h>
+#    include <sys/types.h>
 #else
 #    include <libgen.h>
 #endif
@@ -131,6 +133,7 @@ static track_file_t *
 bin_init(const char *filename, int *error)
 {
     track_file_t *tf = (track_file_t *) malloc(sizeof(track_file_t));
+    struct stat stats;
 
     if (tf == NULL) {
         *error = 1;
@@ -142,7 +145,11 @@ bin_init(const char *filename, int *error)
     tf->file = plat_fopen64(tf->fn, "rb");
     cdrom_image_backend_log("CDROM: binary_open(%s) = %08lx\n", tf->fn, tf->file);
 
-    *error = (tf->file == NULL);
+    if (stat(tf->fn, &stats) != 0) {
+        /* Use a blank structure if stat failed. */
+        memset(&stats, 0, sizeof(struct stat));
+    }
+    *error = ((tf->file == NULL) || ((stats.st_mode & S_IFMT) == S_IFDIR));
 
     /* Set the function pointers. */
     if (!*error) {
diff --git a/src/cdrom/cdrom_image_viso.c b/src/cdrom/cdrom_image_viso.c
index e529bdb96..7d40deb26 100644
--- a/src/cdrom/cdrom_image_viso.c
+++ b/src/cdrom/cdrom_image_viso.c
@@ -38,6 +38,10 @@
 #include <86box/nvr.h>
 // clang-format on
 
+#ifndef S_ISDIR
+#    define S_ISDIR(m) (((m) &S_IFMT) == S_IFDIR)
+#endif
+
 #define VISO_SKIP(p, n)     \
     {                       \
         memset(p, 0x00, n); \
diff --git a/src/include/86box/plat.h b/src/include/86box/plat.h
index 1c17d50bd..aa01ac129 100644
--- a/src/include/86box/plat.h
+++ b/src/include/86box/plat.h
@@ -76,6 +76,10 @@ extern "C" {
 #    define atomic_bool_t atomic_bool
 #endif
 
+#if defined(_MSC_VER)
+#    define ssize_t intptr_t
+#endif
+
 /* Global variables residing in the platform module. */
 extern int dopause,          /* system is paused */
     mouse_capture;           /* mouse is captured in app */
diff --git a/src/include/86box/plat_dir.h b/src/include/86box/plat_dir.h
index 73c33eebf..7a7876ebb 100644
--- a/src/include/86box/plat_dir.h
+++ b/src/include/86box/plat_dir.h
@@ -17,6 +17,8 @@
 #ifndef PLAT_DIR_H
 #define PLAT_DIR_H
 
+/* Windows needs the POSIX re-implementations */
+#if defined(_WIN32)
 #ifdef _MAX_FNAME
 #    define MAXNAMLEN _MAX_FNAME
 #else
@@ -63,5 +65,10 @@ extern void           seekdir(DIR *, long);
 extern int            closedir(DIR *);
 
 #define rewinddir(dirp) seekdir(dirp, 0L)
+#else
+/* On linux and macOS, use the standard functions and types */
+#include <sys/dir.h>
+#endif
+
 
 #endif /*PLAT_DIR_H*/