Purpose of swt-win32-3064.dll - dll

Can anyone tell me the usage of swt-win32-3064.dll

It is a dll required to run the eclipse Standard Widget Toolkit on windows. SWT is a GUI library which uses native GUI libraries on various platforms and therefore give true native look and feel to Java applications.

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What does "common" mean in kotlin documentation?

In kotlin standard library documentation i can see the following filters:
As far as i can gather, JVM means that internals of a package can be compiled into byte code, JS into javaScript and Native into binaries. But what does "Common" mean ?
Common means available for all platforms. It is an API that you can use directly in platform independent code in Kotlin Multiplatform projects.
Kotlin Multiplatform allows you to write common Kotlin code for multiple different platforms. For example, you could have a project with an Android app (using Kotlin/JVM for native Android applications) and a web interface (using Kotlin/JS). Then, you could share code between both subprojects.
As you have guessed correctly, JVM means it is available using Kotlin/JVM (compiling to Java bytecode).
If it is marked with JS, it is available for Kotlin/JS which transpiles the Kotlin code to JavaScript.
Finally, Native means it is available when using Kotlin/Native. This is different from compiling with native-image, which compiles JVM bytecode to native executables. For that, you would still use Kotlin/JVM.
If you write code in "common", then it can be compiled into any of the other targets, so you can share Kotlin code amongst the different platforms you are targeting. You can read more in the documentation.

Can we develop desktop applications in kotlin?

I want to develop Desktop and Android applications. And I want to learn kotlin for this. Kotlin is mostly used for developing Android applications but I want to know that can we develop desktop applications in kotlin?
Yes, you can. Technically any program you can write in Java can also be written in Kotlin*. Of course it's even better when using frameworks that were specially tailored for Kotlin.
There are frameworks like TornadoFX built on top of JavaFX to build desktop UIs.
More recently, Compose has been generalized for Desktop apps (initially JetPack Compose for Android).
*More specifically, Kotlin/JVM compiles to Java bytecode, so you can use Kotlin to target any environment running a JVM that interprets this bytecode (provided the target bytecode version is at most that of the JVM, like in Java).
As pointed out by #Tenfour04, GWT is not in this category because it directly works on the Java source code, not bytecode.

RCP for creating standalone application, later converted to plugin

I am developing an standalone GUI for our in-house tool. After it has matured enough, it is supposed to be integrated into Eclipse as a plugin.
I am a newcomer to Java world. I have read about RCP. Is this is correct use case scenario for RCP? If yes, can I use SWT views in a RCP application/plugin?
Is this is correct use case scenario for RCP?
Yes, RCP is a good fit. You can use the same plugin for providing functionality both in Eclipse and in your standalone application.
If yes, can I use SWT views in a RCP application/plugin?
Yes, of course. Until the latest version of RCP (e4) you could only use SWT for GUI (of course, Swing/JavaFX/etc. can be integrated with SWT).
When you develop an Eclipse RCP based application, you in fact develop a number of plug-ins. If you play by a specific set of limited rules, then your plug-in can run unaltered as part of an RCP application and as part of the larger Eclipse IDE.
(One can easily argue that the IDE is "just" a very large RCP application. The IDE is based on the Eclipse Platform of which Eclipse RCP is just a small sub-set...)
I would recommend two books for your project:
"Eclipse Rich Client Platform (2nd Edition)" by Jeff McAffer, Jean-Michel Lemieux, and Chris Aniszczyk - see Amazon.
"Eclipse Plug-ins (3rd Edition)" by Eric Clayberg and Dan Rubel - see Amazon.
Where the first is more or less the bible for RCP based applications, the later gives you a lot of good examples on how to integrate into the IDE. Very advanced as times, but also very good.

IDE support for extjs apps

Any IDE for development or plugins available for development. Actually I'm using eclipse in java. Thanks if have plug-in for that.
you can use your own development environment. Since It is providing plug-in see here . And detailed process here

Dashcode and Adobe Air

Can Dashcode be used to compile and run Adobe Air projects? If so, how?
No. Dashcode is an IDE for creating Mac Widgets and Webkit based Web Apps. It uses, or a project consists of, HTML, JavaScript and CSS. It also provides a library of parts and "widgets" and prewritten code to shorten the development process and Mac Widgets can interact with the underlying Mac at run time.
When you use it to deploy a project it is not in any way compiling anything but packaging the build elements for deployment.