Test bundles:
http://jre.us.oracle.com/java/re/jdk/8u20/promoted/all/b10/bundles/windows-amd64/jre-8u20-ea-windows-amd64.exe
http://jre.us.oracle.com/java/re/jdk/8u20/promoted/all/b10/bundles/windows-i586/jre-8u20-ea-windows-i586.exe

Steps to reproduce:
0. Download jre8u20-b10
1. Mkdir with name öääüß in your system, e.g. C:\öääüß
2. Install jre8u20-b10 to the dir öääüß: change destination folder to öääüß when you install test jre by double clicking jre-8u20-ea-windows-amd64.exe
3. If jre8u20 can't be installed under the dir öääüß and an error dialog shows up, then this bug is reproduced. See attachment install-error.png

Expected behavior: jre should be installed under folder öääüß
Actual behavior: jre can't be installed under folder öääüß

Note:
There is no such issue with jre8-b132 and jre8u20-b08. This issue starts to show from 8u20-b09.