C drive: NTFS
Testing \??\C:\
NtCreateFile status = 0x0
NtQueryInformationFile status = 0x0
BasicInformation.FileAttributes = 0x16
StandardInformation.Directory = 1
StandardInformation.EndOfFile.QuadPart = 0

    D drive: btrfs
Testing \??\D:\
NtCreateFile status = 0x0
NtQueryInformationFile status = 0x0
BasicInformation.FileAttributes = 0x30
StandardInformation.Directory = 1
StandardInformation.EndOfFile.QuadPart = 0

    E drive: FAT32
Testing \??\E:\
NtCreateFile status = 0xc000004f
EAs not supported, using NtOpenFile instead
NtOpenFile status = 0x0
NtQueryInformationFile status = 0x0
BasicInformation.FileAttributes = 0x10
StandardInformation.Directory = 1
StandardInformation.EndOfFile.QuadPart = 0

    F drive: Empty CD drive
Testing \??\F:\
NtCreateFile status = 0xc0000013
NtQueryInformationFile status = 0xc0000008
BasicInformation.FileAttributes = 0xdeadbeef
StandardInformation.Directory = 255
StandardInformation.EndOfFile.QuadPart = 123456789

    No G drive
Testing \??\G:\
NtCreateFile status = 0xc000003a
NtQueryInformationFile status = 0xc0000008
BasicInformation.FileAttributes = 0xdeadbeef
StandardInformation.Directory = 255
StandardInformation.EndOfFile.QuadPart = 123456789

    Z drive: \\vboxsvr\vm-shared
Testing \??\Z:\
NtCreateFile status = 0xc000004f
EAs not supported, using NtOpenFile instead
NtOpenFile status = 0x0
NtQueryInformationFile status = 0x80000005
BasicInformation.FileAttributes = 0x10
StandardInformation.Directory = 1
StandardInformation.EndOfFile.QuadPart = 4096

    Windows explorer, STATUS_BUFFER_OVERFLOW is expected by Cygwin
Testing \??\C:\WINDOWS\explorer.exe
NtCreateFile status = 0x0
NtQueryInformationFile status = 0x80000005
BasicInformation.FileAttributes = 0x20
StandardInformation.Directory = 0
StandardInformation.EndOfFile.QuadPart = 1053184

    ReactOS explorer, not existing
Testing \??\C:\ReactOS\explorer.exe
NtCreateFile status = 0xc000003a
NtQueryInformationFile status = 0xc0000008
BasicInformation.FileAttributes = 0xdeadbeef
StandardInformation.Directory = 255
StandardInformation.EndOfFile.QuadPart = 123456789