diff --git a/EduNetworkBuilder/PersonClass.cs b/EduNetworkBuilder/PersonClass.cs
index 8de8a33..55bf5a7 100644
--- a/EduNetworkBuilder/PersonClass.cs
+++ b/EduNetworkBuilder/PersonClass.cs
@@ -65,6 +65,12 @@ namespace EduNetworkBuilder
         public PersonClass(string Filename)
         {
             Load(Filename);
+            string FileAndExtension = Path.GetFileName(Filename);
+            string JustFile = Path.GetFileNameWithoutExtension(Filename);
+            if(UserName != JustFile)
+            {
+                throw new Exception(string.Format(NB.Translate("PPF_TamperedFile"), FileAndExtension, UserName));
+            }
         }
         public PersonClass(XmlNode reader)
         {
diff --git a/EduNetworkBuilder/Resources/languages/edustrings.resx b/EduNetworkBuilder/Resources/languages/edustrings.resx
index 98309a8..9c2b67c 100644
--- a/EduNetworkBuilder/Resources/languages/edustrings.resx
+++ b/EduNetworkBuilder/Resources/languages/edustrings.resx
@@ -1857,6 +1857,10 @@
     <value>Stats: {0} Students {1} New Files {2} Skipped (already existed)</value>
     <comment>PPF_StudentWriteStats Stats: {0} Students {1} New Files {2} Skipped (already existed)</comment>
   </data>
+  <data name="PPF_TamperedFile" xml:space="preserve">
+    <value>The filename (without extension) did not match the username to which it was assigned.  The file has been tampered with and is considered invalid.  Filename: {0}  Username: {1}</value>
+    <comment>PPF_TamperedFile = The filename (without extension) did not match the username to which it was assigned.  The file has been tampered with and is considered invalid.  Filename: {0}  Username: {1}</comment>
+  </data>
   <data name="PPF_UserDirectory" xml:space="preserve">
     <value>User File Directory</value>
     <comment>PPF_UserDirectory</comment>