Reading files with invalid encoding in filename

Question

I have this code:

File dir = new File("/home/user/somedir");
for (File child : dir.listFiles()) {
    System.out.println(child.getName());
    if(!child.isDirectory()){
        readLines(child.getPath()); //do something with this file
    }   
}

And i get this output:

cestino
arabika
wkurwi�%87_si�%99
java.io.FileNotFoundException: /home/user/somedir/wkurwi�%87_si�%99 (No such file or directory)

child.renameTo() also doesn't work.

new FileReader(child) instead of child.getPath() doesn't work too:

java.io.FileNotFoundException: /home/user/somedir/wkurwi�%87_si�%99 (No such file or directory)
    at java.io.FileInputStream.open(Native Method)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at java.io.FileReader.<init>(FileReader.java:72)

I know if I manually change file name then file can be easliy read. But why this file is listed by listFiles method but i can't read file using this name? Is there any solution? I have a lot of this files with wrong encoding so I cant change all names manually :) But if there is some automatic method to change their names, even file1, file2 is good.