FULL PRODUCT VERSION :
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Verze 5.1.2600], XP Prof. SP2 CZ

A DESCRIPTION OF THE PROBLEM :
When installing JDK 6 using Windows offline (.exe) installer, after selection of desired parts (JDK, JRE, sources etc.) and installer doing some work, it pops window with following message:

Error 1311: Source file not found: C:\Documents and Settings\User\Data aplikaci\Sun\Java\jdk1.6.0\ss160000.cab. Verify that the file exists and that you can access it.

with "Retry" and "Cancel" buttons. "Retry" doesn't work, "Cancel" aborts installation (after confirmation). File is there, readable.
Moving extracted cabs and msi files from above mentioned directory to another one without spaces and diacritics in path name and running msi installer by hand, installation succeeds.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Download Windows offline installer from java.sun.com page.
Run it.
Select desired packages and continue with installation.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Installed JDK 6.
ACTUAL -
During installation, error window pops up with message:

Error 1311: Source file not found: C:\Documents and Settings\User\Data aplikaci\Sun\Java\jdk1.6.0\ss160000.cab. Verify that the file exists and that you can access it.

and "Retry" and "Cancel" buttons.

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Move unpacked cabs and msi files to directory without spaces/diacritics in it (tried one without both, don't know what exactly of these two is the problem).