What steps will reproduce the problem?
1. Using ".asFiles(Rename.SUFFIX_DOT_THUMBNAIL)"
2. On files which has a "." in the file name.
3. Example: "orig.image.jpg"
4. Will produce: "orig.thumbnail.image.jpg"
5. Instead of the desired output: "orig.image.thumbnail.jpg"

What is the expected output? What do you see instead?
See above.

What version of the product are you using? On what operating system? Which
version of Java (Sun/Oracle? OpenJDK?) ?
Java 7 (1.7.0_04)
Thumbnailator 0.41
Amazon Linux AMI 2012.03

Please provide any additional information below.