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I am assuming that you are talking about File Associated program. If so, use the following link below to change it back.<br />
<a href="http://www.thewindowsclub.com/change-file-associations-windows" rel="ugc">http://www.thewindowsclub.com/change-file-associations-windows</a><br />
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<br />
Will.
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This is on server 2008 r2. I have a file that should be opening with Windows Shell how to I re-associate it?
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Windows 7 and 2008R2 are built on the same kernel so it will be the same steps. also hold shift+right click the file and select Open With &gt;&nbsp;choose default program &gt;&nbsp;select powershell.<br />
<br />
Will.
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Windows Powershell is not showing up but its clearly installed. Also when I browse for it search can't pick it up.
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You can press the browse button and navigate to the default location which is below...<br />
C:\Windows\System32\Window<wbr />sPowerShel<wbr />l\v1.0\<br />
Powershell.exe<br />
<br />
Will.
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windows powershell is located in<br />
C:\Windows\System32\Window<wbr />sPowerShel<wbr />l\v1.0\
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Okay I was able to associate with powershell but I don't believe that is the same as Windows Shell. I have attached a screen shot of another file that I'd like the .truststore to be associated with.<br />
<a href="https://filedb.experts-exchange.com/incoming/2016/01_w02/1066784/Capture.PNG" target="_blank" class="file-inline" title="Capture.PNG (36 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Capture.PNG</a>
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Capture.PNG

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I don't believe the file was ever really associated. As long as the file can be manipulated, I think that is all that matters. Unless you have any insight on that statement I will consider this solved.
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Change it to .bat<br />
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Not clear what your txt file has to judge whether the .bat is an appropriate extention to use.
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<div class="content wysiwyg-content">
I changed a file from a .truststore which opens with windows shell to a .txt. I need to change it back.
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I changed a file from a .truststore which opens with windows shell to a .txt. I need to change it back.

How do I change a file with the extension of .txt to .dll or Windows Shell extension?

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.