Powershell script to remove desert map when opening PUBG (and move it back again after closing it). Place both files in the same directory and create a shortcut to the .bat (if needed).

pubg.bat

@echo off
start powershell -WindowStyle "hidden" -Command "& '.\PUBG.ps1'"

pubg.ps1

# Determine Steam base directory and PUBG Steam ID
$steamRegistryPath = "HKCU:\Software\Valve\Steam";
$steamAppsDir = (Get-Item $steamRegistryPath).GetValue("SteamPath") + "/steamapps/common/"
$pubgSteamAppPath = Get-ChildItem "$($steamRegistryPath)/Apps" -Recurse | Where {$_.GetValue("Name") -eq  "PLAYERUNKNOWN'S BATTLEGROUNDS"} | Select-Object -first 1
$pubgSteamAppId = Split-Path $pubgSteamAppPath -Leaf
$pubgMapsDirectory = "$($steamAppsDir)/PUBG/TslGame/Content/Paks"

# Create temporary folder to move the map files to
$tempDirectory = [System.IO.Path]::GetTempFileName()
Remove-Item -Path $tempDirectory
New-Item -ItemType "directory" -Path $tempDirectory | Out-Null

# Move all maps
Get-ChildItem -Path $pubgMapsDirectory | Where{$_.Name -Match "desert"} | Move-Item -Destination "$($tempDirectory)"

# Launch game
Start-Process "steam://rungameid/$($pubgSteamAppId)"

# Create watcher to see if the game stopped running
$process = $false
While ($true) {
	While (!($process)) {
		Start-Sleep -s 5
		$process = Get-Process "TslGame" -ErrorAction SilentlyContinue
	}
	
	If ($process) {
		$process.WaitForExit()
		Start-Sleep -s 2
		
		# Move maps back to original location
		Get-ChildItem -Path $tempDirectory | Where{$_.Name -Match "desert"} | Move-Item -Destination "$($pubgMapsDirectory)"
		Remove-Item $tempDirectory
		Exit
	}
}