Resizing a resource?

[Marc A. Lepage]

I have a handle to a resource which is just a blob of binary data. It 
was opened like this:

    MemHandle hData = DmGetResource('data', id);
I want to increase its size by a few bytes.
If I try this:
    DmResizeResource(hData, oldSize + 4);
it fails with error code 0x0206 dmErrReadOnly.
I already unlocked the handle so I assume this is because DmGetResource 
opened the database in read-only mode. Is that correct?

What is the easiest way to increase the size of this resource? If I need 
to open the resource as writable, how can I do that? A pointer to a 
tutorial would be appreciated, since the docs seem to consider this a 
bit off the beaten path.

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