what is vm.tmp.vhdx ?

I have virtual machine running on Windows Server 2012 R2 hyperv. Today I was going to move it to different partition when I noticed that there is a large file with the same name as the name of the hard disk with .tmp,vhdx extention.

so in effect there are 2 file in Virtual Disks folder for that machine named:

vmachine.vhdx and vmachine.tmp.vhdx

What is this file?
Can I delete it (it is 150GB)
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pyotrekAsked:
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Cliff GaliherCommented:
There is nothing in Hyper-V that creates such a file by default. If I had to guess, someone wanted to make a backup of the VHD while the VM was stopped before making some sort of change (a de-facto snapshot) and that is how they went about it.
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pyotrekAuthor Commented:
Hmmm - it is only me who has access to it, and I usually in cases like that rename the file in different format (.copy.date.vhd)
I will try to move the file and attempt to start the VM.
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pyotrekAuthor Commented:
I have started the VM with the .tmp.vhdx file moved out of the folder and nothing happened. All seems to be fine. Cliff Galiher's explanation must be correct.
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