Hyper V Cannot Edit Virtual IDE Disk

I have a VM where I need to expand the virtual IDE hard drive, but Hyper v Manager says it cannot be edited because a snapshot exists.  There are no snapshots shown, but there is a .AVDHX file.

I tried renaming the .AVDHX file, but could not start the VM without the file being available.

I need to expand the hard drive - it is my Exchange 2013 C: drive and it has less than 28 GB free.

I am running Windows Server 2012 Datacenter (NOT R2), and Exchange 2013 Standard.
portdataAsked:
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it_saigeDeveloperCommented:
You have to merge the AVDHX file(s) with the VM VHD(x) file before you can modify the disk.  Review 'How to manually merge Hyper-V snapshots into a single VHD'.

-saige-
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
How-To here: TechNet: Manually Merge .avhd to .vhd in Hyper-V

NOTE: It is preferable to run the merge on storage that is both high performance and has enough room to produce the merged VHD file.
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