CMD using Emulator.exe to start the Android emulator--emulator-data image file name

On the command line [CMD] use Emulator.exe to start the Android emulator in two ways:
-EMULATOR-AVD (AVD name)
-Emulator-data (image file name)
The image files in the AVD directory are:

文件                               文件类型cache.img:                         VMS Alpha executableuserdata.img:                      VMS Alpha executableuserdata-qemu.img:                 data   

• Which image file is it?
  Obviously Cache.img is not, userdata-qemu.img is the data type and is not, only userdata.img.

• Actual Operation Verification
  Input:
  Emulator-data UserData
  Or
  Emulator-data Userdata-qemu
  Or
  Emulator-data userdata-qemu.img
  Results:
  C:\users\administrator>ko:cannot detemine type of UserData partition:no image files!
  

  Input:
  Emulator-data userdata.img
  Results:
  

  This model is known according to Figure 2 data: Nexus 5 API x86.

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CMD using Emulator.exe to start the Android emulator--emulator-data image file name