For reverse engineering an application that cache's files without naming them with extensions, further organizing and sorting cache resources going based on header detection. In this case, GIF and PNG were the two focus sources, anything else was 'another' file

Automatic_ReCase9.ps

#### @DSTs 
$pngDir = ".FixedImages"
$gifDir = ".FixedGifs"
$otherDir = ".Others"


#### @Helper->Creates the directory if it does not exist 
foreach ($dir in @($pngDir, $gifDir, $otherDir)) {
    if (-not (Test-Path -Path $dir)) {
        New-Item -Path $dir -ItemType Directory | Out-Null
        Write-Output "Created directory: $dir"
    }
}

#### @Main->View each file in the current dir
Get-ChildItem -File | ForEach-Object {
    $currentFile = $_
    $bytes = Get-Content -Path $currentFile.FullName -Encoding Byte -TotalCount 8 -ErrorAction SilentlyContinue
    
    $isPng = $false
    $isGif = $false
    $status = "-"
    
    ###### @Validator->PNG 
    if ($bytes -ne $null -and $bytes.Length -ge 8 -and
        $bytes[0] -eq 0x89 -and $bytes[1] -eq 0x50 -and $bytes[2] -eq 0x4E -and $bytes[3] -eq 0x47 -and
        $bytes[4] -eq 0x0D -and $bytes[5] -eq 0x0A -and $bytes[6] -eq 0x1A -and $bytes[7] -eq 0x0A) {
        $isPng = $true
        $status = "+"
    }
    ###### @Validator->GIF87a 
    elseif ($bytes -ne $null -and $bytes.Length -ge 6 -and
        $bytes[0] -eq 0x47 -and $bytes[1] -eq 0x49 -and $bytes[2] -eq 0x46 -and 
        $bytes[3] -eq 0x38 -and $bytes[4] -eq 0x37 -and $bytes[5] -eq 0x61) {
        $isGif = $true
        $status = "+"
    }
    ###### @Validator->GIF89a signature (both showed up)
    elseif ($bytes -ne $null -and $bytes.Length -ge 6 -and
        $bytes[0] -eq 0x47 -and $bytes[1] -eq 0x49 -and $bytes[2] -eq 0x46 -and 
        $bytes[3] -eq 0x38 -and $bytes[4] -eq 0x39 -and $bytes[5] -eq 0x61) {
        $isGif = $true
        $status = "+"
    }
    
    
    $Header = if ($bytes -ne $null) {
        ($bytes | ForEach-Object { "0x{0:X2}" -f $_ }) -join " "
    } else {
        "Failed to read header"
    }
    
    $hstr = if ($bytes -ne $null) {
        $charArray = $bytes | ForEach-Object {
            if ($_ -ge 32 -and $_ -le 126) { [char]$_ } else { "." }
        }
        $charArray -join ""
    } else {
        "Failed to read header"
    }
    
    Write-Output "[$status] $($currentFile.Name)"
    Write-Output "    [$status] Header Read (Hex)    | $Header"
    Write-Output "    [$status] Header Read (String) | $hstr"
    

    ###### @MainFunctionality-> Sorts based on what it detected, sends to 
    if ($isPng) {
        Write-Output "    [$status] Is a PNG: True"
        
        $newName = $currentFile.Name
        if (-not $newName.EndsWith('.png', [StringComparison]::OrdinalIgnoreCase)) {
            $newName = "$newName.png"
        }
        
        $destPath = Join-Path -Path $pngDir -ChildPath $newName
        Move-Item -Path $currentFile.FullName -Destination $destPath
        Write-Output "    [$status] Moved to -> $destPath"
    }
    elseif ($isGif) {
        Write-Output "    [$status] Is a GIF: True"
        $newName = $currentFile.Name
        if (-not $newName.EndsWith('.gif', [StringComparison]::OrdinalIgnoreCase)) {
            $newName = "$newName.gif"
        }
        $destPath = Join-Path -Path $gifDir -ChildPath $newName
        Move-Item -Path $currentFile.FullName -Destination $destPath
        Write-Output "    [$status] Moved to -> $destPath"
    }
    else {
        Write-Output "    [$status] Is a known image: False"
        $destPath = Join-Path -Path $otherDir -ChildPath $currentFile.Name
        Move-Item -Path $currentFile.FullName -Destination $destPath
        Write-Output "    [$status] Moved to -> $destPath"
    }
}

Write-Output "[*] PNG files moved to     | $pngDir"
Write-Output "[*] GIF files moved to     | $gifDir"
Write-Output "[*] Other files moved to   | $otherDir"