A quick script to copy Remedy's Control saves from Epic's save location to Steam.

Convert-ControlSaveFiles.ps1

<#
    .Synopsis
        Copies save data from the EGS version of Remedy's Control to Steam's save location.

    .Description
        Old save files appear to be in a file structure similar to:
            %LocalAppData%\Remedy\Control\Default-Epic-User\savegame-slot-00\global.chunk
        Save files for the Steam version seem to be in the format:
            Steam\userdata\<user-id>\870780\remote\savegame-slot-00_global (no extension)
            
        This script naively copies all savegame slot chunks into the new location.
        Though this is not a destructive action, I cannot guarantee anything about your system or how you run it.
        
    .Link
        https://twitter.com/jpruskin/status/1299340706797031424
#>

# This assumes you only have one Steam userdirectory that has Control, and that Steam was installed in your x86 Program Files
$remoteDirectory = Convert-Path ${env:ProgramFiles(x86)}\Steam\userdata\*\870780\remote

foreach ($Chunk in Get-ChildItem -Path $env:LocalAppData\Remedy\Control\Default-Epic-User\savegame-slot-*\*) {
    Copy-Item -Path $Chunk.FullName -Destination (Join-Path $remoteDirectory "$($Chunk.Directory.Name)_$($Chunk.BaseName)")
}