How to write load rule to recursively ignore certain file types

This is my component structure in my RTC workspace:

Component-A
|-- Root-Folder
    |-- Sub-Folder-1
         |-- File2.c
         |-- File2.doc
    |-- Sub-Folder-2
         |-- Sub-Folder-3
              |-- File3.c
              |-- File3.doc
    |-- File1.c
    |-- File1.doc

My requirement is to filter out all *.doc files and load only all *.c files into my sandbox like this:

My Sandbox path
|-- Root-Folder
    |-- Sub-Folder-1
         |-- File2.c
    |-- Sub-Folder-2
         |-- Sub-Folder-3
              |-- File3.c
    |-- File1.c

Learning from article: https://jazz.net/library/article/1015 I tried below load rules

1. using Exclude filter
------------------------------
<scm:sourceControlLoadRule version="1" xmlns:scm="http://com.ibm.team.scm">
    <excludeFilter>
        <filter name=".doc"/>
    </excludeFilter>
</scm:sourceControlLoadRule>

=> Error: Error parsing load rule: cvc-complex-type.2.4.b: The content of element 'scm:sourceControlLoadRule' is not complete. One of '{parentLoadRule, itemLoadRule}' is expected.
=> Why this error occurs ? It is not mentioned in the article 1015 that excludeFilter is dependent on parentLoadRule/itemLoadRule

2. using parentLoadRule and include filter
------------------------------------------------------------
<scm:sourceControlLoadRule version="1" xmlns:scm="http://com.ibm.team.scm">
    <parentLoadRule>
        <component name="Component-A"/>
        <parentFolder repositoryPath="/"/>
        <include>
            <filter pattern="*.c"/>
        </include>
    </parentLoadRule>
</scm:sourceControlLoadRule>

=> Error: There are no qualifying items under / in component Component-A to be loaded into sandbox
=> Why am I not able to use "/" as repositoryPath as shown in article 1015 ?

3. using parentLoadRule and include filter and setting repositoryPath
------------------------------------------------------------------------------------------
<scm:sourceControlLoadRule version="1" xmlns:scm="http://com.ibm.team.scm">
    <parentLoadRule>
        <component name="Component-A"/>
        <parentFolder repositoryPath="Root-Folder"/>
        <include>
            <filter pattern="*.c"/>
        </include>
    </parentLoadRule>
</scm:sourceControlLoadRule>

=> Status of sandbox after loading using this load rule:

My Sandbox path
|-- File1.c

=> This load rule just loads "File1.c" directly into my sandbox (It doesn't even create the "Root-Folder" inside my sandbox). Also, it is not recursive. File2.c, File3.c and their corresponding folder structure is not created inside my sandbox.

Could you please advice on how I could modify the above rule(s) to realize my requirement ? (I'm using RTC 4.0.6)

Thanks in advance.