Batch file script to remove special characters from filenames (Windows)

Question

I have a large set of files, some of which contain special characters in the filename (e.g. ä,ö,%, and others). I'd like a script file to iterate over these files and rename them removing the special characters. I don't really mind what it does, but it could replace them with underscores for example e.g.

Störung%20.doc would be renamed to St_rung_20.doc

In order of preference:

1. A Windiws batch file
2. A Windows script file to run with cscript (vbs)
3. A third party piece of software that can be run from the command-line (i.e. no user interaction required)
4. Another language script file, for which I'd have to install an additional script engine

Background: I'm trying to encrypt these file with GnuPG on Windows but it doesn't seem to handle special characters in filenames with the --encrypt-files option.

Answer 1

Thanks to Tomalak who actually pointed me in the right direction. Thought I'd post here for completeness.

The problem seems to be that the codepage used by GPG is fixed (Latin I) independent of the codepage configured in the console. But once he pointed this out, I figured out how to workaraound this.

The trick is to change the codepage before generating the file list. This will actually make the filelist appear to be incorrect when viewed in the console. However, when passed to GPG, it works fine. GPG accepts the files and spits out the encrytped files with correct filenames.

The batch file looks something like this:

chcp 1252
dir /b /s /a-d MyFolder >filelist.txt
gpg -r [email protected] --encrypt-files <filelist.txt