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Set custom process name for JAR application with launch4j?

I'm trying to set a custom process name for a jar application I am using, so that in the Task Manager, instead of it being shown as Java (TM) Platform SE Binary, it will display the application name and chosen icon.
Have tried to wrap the jar as an exe file with launch4j, but cannot seem to find a way to change the process name with this. From what I can tell from google searches, it seems like it may no longer be supported, however, the posts I have found a quite dated, so it could have changed.
Anyone know if there is a way to archieve this with launch4j, or perhaps with another free tool?

Open With... a java program

I want to know how to make a java program that can be used to open stuff up. Ex: notepad++, win zip.... Do I have convert the jar to .exe first? Also, does the file chosen get passed in to String[] args?
By the way, I know that it works with cmd but thats not what I'm asking.

Depends on the OS. Under windows, you need to attach some details into the registry.
Have a look at the 3rd answer in Utilising a file association in a Java application for an example?
You could also have a look at http://www.rgagnon.com/javadetails/java-0592.html
UPDATE
Also, when the OS executes the program, you should receive the file as a command line parameter through the main method
I don't know if this will work suit your needs or not, but you could also take a look at File association in Mac

There's many choices on how to make a Java program runnable. Like you mention, the simplest choice is to use the command line. If you want to make it work with most OS's GUI interfaces (and the Open With dialog) the easiest choice is to make an executable jar. IDEs can make this very easy for you, in Eclipse just right-click on the project and select Export > Java > Runnable JAR file.
Another excellent option is to turn your application into a Java Web Start application, which lets users easily run Java programs being served up online.
Alternatively, like you mention, you could convert it into an .exe file:
Compiling a java program into an executable
How do I create an .exe for a Java program?
How can I convert my Java program to an .exe file?

Deploy the app. using Java Web Start.
JWS provides many appealing features including, but not limited to, splash screens, desktop integration, file associations, automatic update (including lazy downloads and programmatic control of updates), partitioning of natives & other resource downloads by platform, architecture or Java version, configuration of run-time environment (minimum J2SE version, run-time options, RAM etc.), easy management of common resources using extensions..
Here is a demo. of the file services in which the app. is associated with the file type .zzz.
..does it get passed via the windows file chooser?
No. It gets passed to the main as either -open filename or -print filename. What the app. does with those strings is up to it. The demo. linked above will prompt the user in the sand-boxed version, simply because it is sand-boxed. The other one should work without showing prompt or dialog.

Set write permissions on ProgramData subfolder using JNA

I have a program, written in Java, which originally used its directory in Program Files to write files accessible to all users of this program. This required our users to run as administrator all the time. In an effort to alleviate that, we decided to move files which needed to be written during regular usage to the ProgramData folder using the %ALLUSERSPROFILE% environment variable. Using a subfolder in this directory for our application works great if it is designated as writable during the installation process, which works fine using NSIS.
The problem comes with upgrading existing users. The Java File API provides setWritable but this does not appear to work after testing on development machines. It looks as though the new file API with Java 7 would solve this problem, but with no release date on the horizon I would rather not wait.
It seems the simplest solution would be to use JNA to call the appropriate Windows API call to set this directory writable. Since upgrading the software necessitates admin rights, similar to installing, it should let this change go through fine. However, I'm unsure where to start, having never used JNA before or the Windows API. Suggestions as to which Windows library to load and what functions to call would be appreciated, especially if someone has encountered a similar problem before.

Well, I'm glad you gave some background...You could use JNA, but the easier way would be to execute a call to the command-line utility cacls. It's included by default in Windows XP installations, I believe, so it should do the trick for you. Try Runtime.getRuntime().exec("C:\\Windows\\System32\\cacls.exe"+options)
Check out the documentation here -> http://technet.microsoft.com/en-us/library/bb490872.aspx

I use the follow line:
Runtime.getRuntime().exec( "C:\\Windows\\System32\\icacls.exe \"%ProgramData%\my application" /grant *S-1-5-32-545:(OI)(CI)(W,M)" );
S-1-5-32-545 is the SID for BUILTIN\Users because the name work only on English systems. https://support.microsoft.com/de-de/kb/163846
This give the BUILTIN\Users write access to all files in the given directory independent which user has create it.

Java api to get Microsoft Windows Special folders

I once found a nifty little library that used JNI to allow java applications on Windows to get the locations of various "special" directories on windows. I can't for the life of me find it again...
In particular, I need to get the location of the "All Users" (shared) "Application Data" directory.
So, anyone have a bullet proof way in Java to locate the "All Users" "Application Data" folder?
It needs to be bullet proof.

You might want to research Environment Variables:
http://en.wikipedia.org/wiki/Environment_variable#DOS_and_Windows
http://en.wikipedia.org/wiki/Environment_variable#System_path_variables
The System.getenv() method offers a list of the system's environment variables and it's included in the core library. Doesn't get much more bullet-proof than that.

You could use the following property in the environment:
ALLUSERSPROFILE=C:\Documents and Settings\All Users
Edit: This no longer works as of Windows Vista and newer.

Cross-platform executable/runtime delivery method

I need assistance finding a delivery method that best fulfills the following requirements:
We wish to deliver a single file to my clients.
Clients should be able to launch this file from the operating system shell - much like running an '.exe' on Windows.
After being launched, the program/script should be able to display a window with HTML content. this may be done using a stand alone program, a runtime or by running within a browser.
We need the ability to embed a resource within the delivered file, such as an mp3 file, which i can later extract programmatically.
Optimally, the solution should run on Windows, Mac and Linux machines. Less than perfect cross-platform interoperability is acceptable, but we want as broad a penetration as possible.
Clients should not need to pre-install anything (unless it is done transparently), pre-configure anything, or approve any thing for this to happen.
For example:
We could use a regular executable file, written in C++ to do this, but it will not be cross-platform.
We could use a sliverlight XAP file, an adobe Flex file or a Java JAR, but internet explorer warns users when local content is launched. In addition these approaches mean that we have less than perfect penetration, even though it is acceptable in these cases.
We could use a python (or equivalent) script, but the installed-base (penetration) of the python interpreter is not good enough.
Using a standard HTML is not enough because of the difficulty of embedding resources in it. Embedding Silverlight XAML or uuencoded content in HTML causes IE to display a warning.
Using something along the lines of a jpeg as a delivery method is not rich enough since we need to display HTML.

..but internet explorer warns users when local content is launched..
I don't get it, what's the problem with IE saying "Hey this app is trying to run your files!"
I don't mean you don't have a good reason for this, it is just, I don't get it.
IE will only warn the user if the app has not been downloaded and try to access local resources, for instance if running from an applet or a JNLP like this one:(click on the first orange button you see )
But if the users download the jar and run it from the computer ( double click on it ) the app is local and can run without problems.
The jar file is a zip file after all, so you can attach your mp3 file with it. Double click is supported in the desired platform, and the HTML content could be either a local file ( un-packed along with the mp3 file ) or an internet web page.
Java is preinstalled on those OS already.

"internet explorer warns users when local content is launched"
There's a reason for this. How can they distinguish your excellent, well-behaved, polite application from a virus?
Since the line between your app and a virus is very, very blurry, go with any of Silverlight XAP file, an adobe Flex file or a Java JAR.
The IE business is a good thing, not a bad thing.

You could try using the 'Jetty' application server.
This supposes there is a working java environment on the target machine.
Jetty is java servlet container but it is possible to configure
everything (web server, html templates, applications, etc.) in a
single executable jar, which launches the web server and opens a default page.
Exactly how the jar file is launched will vary from platform to platform
but otherwise the user interface will be identicle, and, as its a java application
you can do pretty much anything one it has started.

Sounds like MIME HTML does exactly what you want - unfortunately, it is not supported by many browsers other than IE.

I'd investigate Adobe AIR. It can display both HTML and Flex content in a desktop application without using a web browser. However this will require installation of the AIR runtime, also I'm not sure if the Linux version is out of the beta stage.
http://www.adobe.com/products/air/

You can also use a binary for each platform.
As per your description the app is very simple, and porting from one platf to another sounds like just matter of re-compile and offer binary based on the dist.
Is this an option?