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BAT is not something that opens a file. Something inside might, but BAT is not an extension you can associate with a file. Windows will not know what it might expect. <br />
<br />
You need to associate your file with an application that can open it.
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I am not sure why you could have, unless a defect in a past system. <br />
<br />
I am looking at my Windows 10 V1809 machine, settings, select app by file type. &nbsp;<br />
<br />
If only one possible app, that is all you see. <br />
If multiple apps (like PDF), you see all the options. <br />
If no apps, you see + &nbsp;and the only option is the store. <br />
<br />
BAT is never an option.
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You can try with Windows Explorer to see if you can associate your extension with a BAT file. <br />
<br />
Look down the page to the section titled Now What?<br />
<br />
<a href="https://techforluddites.com/windows-10-change-the-default-programs-for-opening-files/" rel="ugc">https://techforluddites.com/windows-10-change-the-default-programs-for-opening-files/</a><br />
<br />
See if that helps you
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Hi All. Situation is this. I have a file that needs to be opened by a .bat file. The problem is the file extension is .ZPL and Windows 10 associates that with Groove. I have used PS to remove Groove, but then when I try to associate the file with the bat file in Settings, I cannot! Microsoft will only allow me to select/associate files from its store. I have tried right clicking on the file and telling it to always use my bat file, but it will not save this preference. Does anyone know a what around this w/WIN10? Thanks.
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Hi All. Situation is this. I have a file that needs to be opened by a .bat file. The problem is the file extension is .ZPL and Windows 10 associates that with Groove. I have used PS to remove Groove, but then when I try to associate the file with the bat file in Settings, I cannot! Microsoft will only allow me to select/associate files from its store. I have tried right clicking on the file and telling it to always use my bat file, but it will not save this preference. Does anyone know a what around this w/WIN10? Thanks.

BAT is not something that opens a file. Something inside might, but BAT is not an extension you can associate with a file. Windows will not know what it might expect. 

You need to associate your file with an application that can open it.

Yes but we have done this in the past fine.

I am not sure why you could have, unless a defect in a past system. 

I am looking at my Windows 10 V1809 machine, settings, select app by file type.  

If only one possible app, that is all you see. 
If multiple apps (like PDF), you see all the options. 
If no apps, you see +  and the only option is the store. 

BAT is never an option.

You can try with Windows Explorer to see if you can associate your extension with a BAT file. 

Look down the page to the section titled Now What?

https://techforluddites.com/windows-10-change-the-default-programs-for-opening-files/

See if that helps you

Cannot associate a file to bat file in Windows 10

Windows 10 is a personal computer operating system featuring the "universal application architecture" (UAP); apps can be designed to run across multiple devices with nearly identical code, including PCs, tablets, smartphones, embedded systems, Xbox One, Surface Hub and HoloLens. Windows 10 also includes a virtual desktop system, a window and desktop management feature called Task View, the Microsoft Edge web browser, support for fingerprint and face recognition login, voice-based search (Cortana), new security features for enterprise environments, and DirectX 12 and WDDM 2.0 to improve the operating system's graphics capabilities for games.