用于从文件名中删除特殊字符的批处理文件脚本（Windows）

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.I have a large set of files, some of which cont