How to Convert Codepage 1250 to 852 (middle Europe) to import text

I have written PowerShell scripts for this. All you need to do is to exchange your required codepage numbers in the script.
http://www.msdynamics.de/viewtopic.php?f=17&t=25726
In your case it would look like this:

Function Convert_ANSI1250_OEM852
            {
            $args = resolve-path $args
            $WorkingFolder = Split-Path -Parent $args
            $sourceEncoding = [System.Text.Encoding]::GetEncoding(1250)
            $targetEncoding = [System.Text.Encoding]::GetEncoding(852)
           
            $convertedFileName = [System.IO.Path]::GetFileNameWithoutExtension($args) +"_OEM852" + [System.IO.Path]::GetExtension($args)
            $convertedfile = New-Item -path "$WorkingFolder\$convertedFileName" -type file
           
            $textfile = [System.IO.File]::ReadAllText($args, $sourceencoding)
            [System.IO.File]::WriteAllText($convertedfile, $textfile, $targetencoding)
            Write-host $args 'converted to' $convertedFileName
            }

Call the function together with the path to your source file, the converted one will be written to the same folder.

Keep in mind that further processing into NAV requires your OS regional settings to have a country in middle europe that uses these codepages (like PL, CZ, etc.) as well for the special characters to look right (also for the Windows editor, in Notepad++ you can change the codepage encoding settings to check the result visually beforehand).