vix api doesn't recognize my disk

I have two disks as<code>.vmdk</code> </span>

<span style="border-collapse: collapse; font-family: Arial,'Liberation Sans','DejaVu Sans',sans-serif; line-height: 18px; text-align: left" to mount the virtual disk.The disk may be inuseby a virtual machine, may not have enough volumes or mounted under another drive letter.Ifnot, verify that the file is a valid virtual disk file.</span>&lt;/code&gt;

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Thinking it's a problem with the utility, I downloaded the SDK and made
my own simple program in C to try to mount a disk. It just initializes
the API, connects to it, then attempts to open the disk. I get this
error, once again claiming it is not a virtual disk:<br/><br/><br/><br/>

&lt;code&gt;

The files are clearly virtual disks, though, since I can actually mount

and use them with a virtual machine. I tried detaching them from any

VMs and trying again, but I got the same results.

<span style="border-collapse: colla<p>Any ideas? Maybe the "descriptor above max size" is a hint?</p></span>