Find and Modify Registry values based on Subkey Name

Question

Finding this PowerShell script difficult:

Pic of my registry

|
|__SyncRootManager
  |
  |____OneDrive!S-1-5-21-SID
  |          |_____UserSyncRoots
  |
  |____OneDrive!S-1-5-21-SID
             |_____UserSyncRoots

For every subkey called "UserSyncRoots" that is a child of OneDrive!S-1-5-21-SID (which are children of "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\SyncRootManager"), it contains just one Reg Value that is named "S-1-5-21-SID" - how would I modify each Reg Value to "C:\AnyOldPath"

I was using Get-ChildItem in a foreach loop but I think I am going down the wrong path completely. Thank you for any help you can give.

Edit, oops, forgot to add my code

$registry = Get-ChildItem "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\SyncRootManager" -Recurse
Foreach($a in $registry) {
    if ( $a.PSChildName -eq "UserSyncRoots" )
    {
        $subkeys = (Get-ItemProperty $a.pspath)
        #Get-ItemProperty - OK I'm lost here
    }
}

Answer 1

Untested (don't have those keys), but assuming no permissions issues, this should work or be close:

---

Edited 1/31/24 : Added filtering on ProviderName, removed hard-coded string from processing and replaced with variable, and modified some variable naems.

---

###   Good idea to use single quotes unless string expansion is needed
$SyncMgrPath     = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\SyncRootManager'
# adding regex for -Match filtering
$ProviderFilter  = '\\OneDrive\![\d\-]+$'  # <backSlash>OneDrive!<digitsAndDashes><endOfLine>
$TargetKey       = 'UserSyncRoots'
$NewValue        = 'C:\AnyOldPath'

Get-ChildItem $SyncMgrPath -Recurse |
  where PSParentPath -match $ProviderFilter |
    where PSChildName -eq $TargetKey |
ForEach-Object {
    $splat = @{
        'Path'  = $_.PSPath
        'Name'  = $_.Property[0]
        'Value' = $NewValue
        'Type'  = 'String'
    }
    Set-ItemProperty  @splat
}

Note that (based on your question) there is no testing for the entry's existence or current value -- if it exists, its value is changed, if it doesn't exist, it's created.

• Registry value types
  • Optional for strings and integers (DWORD), but necessary for other types.
  • Valid values
    • Binary
    • ExpandString
    • MultiString
    • None
    • QWord
    • String
    • Unknown