PDF file saving as Chrome HTML Document

I had to reinstall Acrobat Pro after some computer issues and every single .pdf was changed to a chrome html extension afterward. 

I fixed it this way ...

Open Acrobat

Edit > Preferences > General

At the very bottom click - "Select as Default PDF Handler"

When the dialog box opened on my machine it said "Keep using" and had Acrobat selected. I clicked on Acrobat again anyway and said ok. It instantly changed them all back to a .pdf extension. Even though it appeared like Acrobat was the default .pdf handler I guess there was a disconnect somewhere and it just needed a reminder of what it was supposed to use 🐵

Found an easier fix. 
Control panel

Default programs

Associate file type or protocol

Apps & features

choose Acrobat 

Modify

then follow prompts to repair. 
Ot fixed the problem and changed all my "html pdf" files back to .pdf files

Well, I noticed everyones answer but many of them didn't solve the issue for me. If anybody else said click on a pdf file within file explorer, right click on Properties, Opens with . . . . CHANGE to Adobe Acrobat, Apply, OK I would agree

I am having the problem with my pdfs and google chrome. I followed the instructions:

Click on MS icon on left corner of the task bar (4 rectangles or windows sign)2. Right click > Control panel > Control Panel\Programs\Default Programs\Set Associations3. Sort by Description (Other available options are Name, Current Default)4. You will notice that the (Adobe Acrobat Document) PDF files have been associated with Chrome

The problem s that the control panel doesn't appear with I right or left click. The only way I can get to it is if I do a search. Then I open it, click on Programs, then Default Programs. There is no Set Associations at that time. My choices are: Set your defult Programs, Associate a file ype or Protocol with a Program, Change AutoPlay Settings, and Set Program Access and Computer Defaults. I've gone into each of these and cannot find the next step. I'm at a loss. Can anyone help?

April 2022 UPDATE. These instructions from krishnaa0205 no longer work (MS has made changes). Here are VERY SIMPLE instructions to fix this issue. You can watch a quick video from Adobe support, or scroll down below the video for step-by-step instructions with screenshots.

https://helpx.adobe.com/ca/acrobat/kb/not-default-pdf-owner-windows10.html

This worked after many failed attempts trying other proposed solutions - thank you! One other option here, as I had trouble figuring out the last step in Windows 11, is W11 gives you an option to reset all files to default open app. which solved the issue for me. 

I tried everything as advised, open with, save as etc...  Bottom line for me was that I removed the chrome extentions that has anything to do with PDF.

Happened to me too. After research I found an easy solution:

1 Go to Settings, then select "Apps".

2 On left side, Select Default Apps".

3 Under Default Apps, Select "Set Default By Apps" highlighted in blue.

4 Select "Adobe Acrobat DC", then select "Manage".

5 Change the .pdf from Chrome to Adobe by clicking on the chrome symbol.

This should fix your issue.

When for some reason everything that came from somewhere other than things I created were html rather than pdf I started looking for solutions. After trying all type of things to no avail, I finally came up with the best and easiest solution. I completely deleted the adobe pdf extension from Chrome and restarted my computer. When everything came back up, all downloaded files were magically changed to a pdf  file type rather than html.

I am running Windows 10 with all updates  and have the latest updates installed of Chrome.