If you open the CSV files exported from the vSphere Client by using export button at the bottom left corner of the list view on Microsoft Excel or other application, you see characters in the file such as Japanese and Chinese are not properly displayed.
vCenter Server 7.x
vCenter Server 8.x
The CSV file is exported in UTF-8 format but is missing a byte-order mark (BOM).
This issue is fixed in vCenter Server 7.0 U3v and 8.0 U3b.
Workaround:
Get-VM | Select Name, NumCpu, MemoryGB, VMHost, PowerState, ProvisionedSpaceGB, UsedSpaceGB | Export-Csv -Path C:\export\VM_Inventory.csv -Encoding utf8