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diff --git a/magic/Magdir/msdos b/magic/Magdir/msdos
index 8f3e532..21f055d 100644
--- a/magic/Magdir/msdos
+++ b/magic/Magdir/msdos
@@ -811,6 +811,21 @@
>>24 bequad x \b, %lld bytes
>>32 belong 1 \b, AES-encrypted
+>4 belong 3 (v3)
+# Using the existence of the Backing File Offset to determine whether
+# to read Backing File Information
+>>8 bequad >0 \b, has backing file
+# Note that this isn't a null-terminated string; the length is actually
+# (16.L). Assuming a null-terminated string happens to work usually, but it
+# may spew junk until it reaches a \0 in some cases. Also, since there's no
+# .Q modifier, we just use the bottom four bytes as an offset. Note that if
+# the file is over 4G, and the backing file path is stored after the first 4G,
+# the wrong filename will be printed. (This should be (8.Q), when that syntax
+# is introduced.)
+>>>(12.L) string >\0 (path %s)
+>>24 bequad x \b, %lld bytes
+>>32 belong 1 \b, AES-encrypted
+
>4 default x (unknown version)
0 string/b QEVM QEMU suspend to disk image