Plugin DLL not working in Windows Server 2012 R2

I have a modified version of lib_mysqludf_sys (limits the programs that can be run). On Windows 7 Ultimate SP 1 64 bit) it works just fine. On Windows Server 2012 R2 I get:

 ERROR 1126 (HY000): Can't open shared library 'mysql_UDF.dll' (errno: 2, The specified module could not be found.

Following is more information:

C:\Program Files\MariaDB 10.1\lib\plugin>dir /q *.dll
 Volume in drive C has no label.
 Volume Serial Number is 1EBA-5D2D

 Directory of C:\Program Files\MariaDB 10.1\lib\plugin
.
.
.
10/15/2015  04:42 PM            48,456 NT AUTHORITY\SYSTEM    metadata_lock_info.dll
11/19/2015  06:46 PM            44,032 NT AUTHORITY\SYSTEM    mysql_UDF.dll
10/15/2015  04:42 PM            48,456 NT AUTHORITY\SYSTEM    query_cache_info.dll
.
.
.
              19 File(s)      5,186,832 bytes
               0 Dir(s)  338,428,325,888 bytes free

C:\Program Files\MariaDB 10.1\lib\plugin>mysql -h 127.0.0.1 -u root -p
Enter password: *********
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 2
Server version: 10.1.8-MariaDB mariadb.org binary distribution

Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> create database EMR;
Query OK, 1 row affected (0.00 sec)

MariaDB [(none)]> CREATE FUNCTION sys_exec RETURNS int SONAME 'mysql_UDF.dll';
ERROR 1126 (HY000): Can't open shared library 'mysql_UDF.dll' (errno: 2, The specified module could not be found.
)
MariaDB [(none)]> show variables like '%plug%';
+-----------------+-------------------------------------------+
| Variable_name   | Value                                     |
+-----------------+-------------------------------------------+
| plugin_dir      | C:\Program Files\MariaDB 10.1\lib\plugin\ |
| plugin_maturity | unknown                                   |
+-----------------+-------------------------------------------+
2 rows in set (0.00 sec)

MariaDB [(none)]>
--------------------------------------------------------------------------------------------------------------------------------------------------------------------/

I tried mysql version 5.7.9 and have the same error. Any ideas?

Thanks, Charles Fischer