JWS - JNLP - icon using .ico-files?

After reading the enhancements here http://download.oracle.com/javase/6/docs/technotes/guides/javaws/enhancements6.html
I tried to use .ICO-files in the JNLP-<icon>-Tag without success. Also .PNG-files don't work.
The search with google also found only questions but no answers.
Additionally I only found samples using .GIF-files!
We want to use "rounded" pictures for desktop links, thus we need a format with transparent colors support.
Additionally we want to have the ability to use different sizes depending on desktop settings.
The .ICO-file format - out of the box - supports both of that!
Does anyone has a RUNNING sample-JNLP using an .ICO-file or .PNG-file? Or can point me to a solution to that problem?
Running: Java 1.6.0.22, Windows XP & Windows 7
Thanks in advance

Hello,
have you took the application/x-java-archive-diff MIME type into your tomcat-web.xml?
I have found this in the jnlp-specifications:
>
6.3 Version-based Download Protocol
For the version-based download protocol, all resources are uniquely identified by a URL/version-id pair. Thus, a JNLP Client can at any given time request a specific version of a resource located at a specific URL.
The JNLP Client issues an HTTP GET request that includes the specific version of the resource that it needs. The request includes the field version-id, which specifies the requested version. For example, given the following jar element:
<jar href="http://www.mysite.com/b.jar" version="2.3+"/>
then the JNLP Client must issue the following HTTP GET request14:
http://www.mysite.com/c.jar?version-id=2.3%2B
The JNLP Client must examine the HTTP response status code and MIME type to determine if the result was successful. The valid responses are described in section 6.1.2. For the above jar element, the application/x-java-archive-diff MIME type cannot be returned. It can only be returned for incremental requests.
The version string used in the request is not necessarily exact, e.g., 2.3+. The Web server must specify the exact version-id of the resource that is returned in the response by setting the HTTP header field: x-java-jnlp-version-id. The exact version returned must be one that matches the requested version string.
6.3.1 Incremental Updates for JAR files
JNLP allows incremental updates to be applied to JAR files. Typically, downloading an incremental update will be much faster than downloading the new version. Incremental updates are distributed in the form of JARDiff files, which are described in Appendix B.
If the JNLP Client has a previous version of a given JAR file already cached, e.g., version 2.2, then this fact can be specified in the request. The Web server can then potentially provide an incremental update that can be applied to the existing file, instead of returning the contents of the new file.
An incremental update is enabled by providing information about the version that is already cached by the JNLP Client in the HTTP request. The field current-version-id is used to specify the existing local version. For example:
http://www.mysite.com/c.jar?version-id=2.3%2B&current-version-id=2.2
The current-version-id must always be exact. If several versions of a given resource are in the cache, then the highest version-id that is lower than the requested version should be used. The Web server is not required to return an incremental update, but could just return the requested JAR file.
The returned contents of the response are the same as for the request without the current-version-id field, except that a JARDiff file might be returned. In that case, the response MIME type must be application/x-java-archive-diff.
>
MfG
hansmueller

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