diff --git a/project.c b/project.c
index a68c3e5..8741ad4 100755
--- a/project.c
+++ b/project.c
@@ -195,9 +195,17 @@ int GetFileFormatFromExt(const char* csPath)
 
     while(csPath[i] != '.')
     {
+        if (i==0) {
+            return BIN;
+        }
+
         i--;
     }
 
+    if (length-i > 5) {
+        return BIN;
+    }
+
     for(j=i;j<length; j++)
     {
         fmt[j-i]=toupper(csPath[j]);