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You'd probably have to resort to the Win32 imports to do this, however there are some issues that you'll encounter:<br />
Retrieving an icon from an executable is (relatively) easy, saving it back to the executable isn't something I'm familiar with.<br />
You'll need to manipulate the main executable from a 2nd executable as the main executable will be locked while it's running.<br />
<br />
To get yourself started you'll have to use something like ExtractIcon from shell32.dll<br />
<a href="http://msdn.microsoft.com/en-us/library/ms646973(VS.85).aspx" rel="ugc">http://msdn.microsoft.com/en-us/library/ms646973(VS.85).aspx</a>
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You'd probably have to resort to the Win32 imports to do this, however there are some issues that you'll encounter:
Retrieving an icon from an executable is (relatively) easy, saving it back to the executable isn't something I'm familiar with.
You'll need to manipulate the main executable from a 2nd executable as the main executable will be locked while it's running.

To get yourself started you'll have to use something like ExtractIcon from shell32.dll
http://msdn.microsoft.com/en-us/library/ms646973(VS.85).aspx [http://msdn.microsoft.com/en-us/library/ms646973(VS.85).aspx]

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I just found out that somebody has asked a question pretty much like mine.<br />
<a href="https://www.experts-exchange.com/questions/24294859/Changing-Icon-of-External-EXE-in-Vb-net.html" rel="ugc nofollow">https://www.experts-exchange.com/questions/24294859/Changing-Icon-of-External-EXE-in-Vb-net.html</a>
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I just found out that somebody has asked a question pretty much like mine.
https://www.experts-exchange.com/questions/24294859/Changing-Icon-of-External-EXE-in-Vb-net.html [https://www.experts-exchange.com/questions/24294859/Changing-Icon-of-External-EXE-in-Vb-net.html]

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I still haven't managed to make some progress with this, so i'll do some rephrasing:<br />
I need to change an icon (resource) of another executable within vb.net. Possible?
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I still haven't managed to make some progress with this, so i'll do some rephrasing:
I need to change an icon (resource) of another executable within vb.net. Possible?

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Don't know if it is even possible.<br />
<br />
I have an application written in VB.Net. I want to change its executable icon at runtime, from that same application. It doesn't matter if the application needs a restart. <br />
If someone could help me change some other exe's icon through VB.net, it would help me a lot.<br />
<br />
Thanks in advance.
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Don't know if it is even possible.

I have an application written in VB.Net. I want to change its executable icon at runtime, from that same application. It doesn't matter if the application needs a restart. 
If someone could help me change some other exe's icon through VB.net, it would help me a lot.

Thanks in advance.

Icons and VB.net

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.

.NET Programming

Visual Basic .NET (VB.NET) is an object-oriented programming language implemented on the .NET framework, but also supported on other platforms such as Mono and Silverlight. Microsoft launched VB.NET as the successor to the Visual Basic language. Though it is similar in syntax to  Visual Basic pre-2002, it is not the same technology,