Which process is locking a DLL

tasklist /m thelocked.dll

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Optional features

Check available optional features: DISM /Online /Get-Capabilities Install an optional feature: DISM /Online /Add-capability /capabilityname:Media.MediaFeaturePack~~~~0.0.1.0

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AD retention period

Check AD retention tombstone value: Import-Module ActiveDirectory $ADForestconfigurationNamingContext = (Get-ADRootDSE).configurationNamingContext $DirectoryServicesConfigPartition = Get-ADObject -Identity “CN=Directory Service,CN=Windows NT,CN=Services,$ADForestconfigurationNamingContext” -Partition $ADForestconfigurationNamingContext -Properties *

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