What is the purpose of Target in Get-ItemProperty of powershell - powershell

Question

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I am wondering what's the purpose of Target? If the type of Target is hash, how to set the key/value.
PS Set-ItemProperty -Path a.txt -Name Target -Value { "key1":"value1"}
At line:1 char:58
+ Set-ItemProperty -Path a.txt -Name Target -Value { "key1":"value1"}
+ ~~~~~~~~~
Unexpected token ':"value1"' in expression or statement.
+ CategoryInfo : ParserError: (:) [], ParentContainsErrorRecordException
+ FullyQualifiedErrorId : UnexpectedToken

Answer 1

As for your post title:
What is the purpose of Target in Get-ItemProperty of powershell
Use Get-Member to find out.
(Get-ItemProperty -Path 'D:\temp\ZenMusic.mp3' |
Get-Member) -match 'Target' |
Format-List
# Results
<#
TypeName : System.IO.FileInfo
Name : Target
MemberType : CodeProperty
Definition : System.Collections.Generic.IEnumerable`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]
Target{get=GetTarget;}
#>
As you can see, there is no setter for this property.

Answer 2

There is a target property for symlinks that's just a string, but it can't be set with set-itemproperty (Set accessor is unavailable).
New-Item -Path c -ItemType SymbolicLink -Value c:\ # elevated prompt
get-item c | % target | % gettype
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True True String System.Object
get-itemproperty -path c -name target
target : {C:\}
PSPath : Microsoft.PowerShell.Core\FileSystem::C:\Users\admin\foo\c
PSParentPath : Microsoft.PowerShell.Core\FileSystem::C:\Users\admin\foo
PSChildName : c
PSDrive : C
PSProvider : Microsoft.PowerShell.Core\FileSystem
Set-ItemProperty -Path c -Name Target -Value c:\users
Set-ItemProperty : Set accessor for property "Target" is unavailable.
At line:1 char:1
+ Set-ItemProperty -Path c -Name Target -Value c:\users
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Set-ItemProperty], SetValueException
+ FullyQualifiedErrorId : SetWithoutSetterFromCodeProperty,Microsoft.PowerShell.Commands.SetItemPropertyCommand