1 files changed, 1 insertions, 1 deletions

diff --git a/src/WixToolset.Core/Common.cs b/src/WixToolset.Core/Common.cs
index 6efc7571..1bb895be 100644
--- a/src/WixToolset.Core/Common.cs
+++ b/src/WixToolset.Core/Common.cs
@@ -253,7 +253,7 @@ namespace WixToolset.Core
                 {
                     return filename.Length < 9;
                 }
-                else if (expectedDot > 8 || filename[expectedDot] != '.')
+                else if (expectedDot > 8 || filename[expectedDot] != '.' || expectedDot + 4 < filename.Length)
                 {
                     return false;
                 }