Windows 8.1 64-bit: PDF icons in File Explorer fail to show

Question

On my Windows 8.1 Pro 64-bit it seems impossible for File Explorer to create thumbnails of my PDF files. 
I use Adobe Acrobat X as my default PDF application.
I did some thorough research to find a solution. I expected a simple fix, but the problem persists hence this post.
There is only one work-around that works (from Adobe Community link below):
If you click Open in Acrobat
In the Explorer window select show large icons
Thumbnails will be created which will be visible in File Explorer.
My problem with the work-around is the extra work required to generate thumbnails. I have many PDF's whose front page thumbnail I use to select my file of choice.
What fix have I over-looked?
Cheers.
Dave---
I applied all these solutions:
Icon cache rebuildRemoved IconCache.db in %localappdata%
File Explorer > Options > View "Always show icons, never thumbnails"= off
Default application to open PDF Set to Adobe Acrobat in File Explorer
Default PDF handler set in Adobe Acrobat:
Click Edit > Preferences… 
Click the button Select Default PDF handler
Click Apply. Acrobat will start an installer and processes the configuration changes.
Checked system with sfc /scannowNo problem detected
Removed thumbnails with Disk Clean-up
References:
http://www.pretentiousname.com/adobe_pdf_x64_fix/#downl
https://forums.adobe.com/thread/949406
http://www.sevenforums.com/tutorials/49819-icon-cache-rebuild.html

Answer 1

For many days I searched for answer of how an Internet Explorer add-on installed because few websites won't run without it, but Windows OS or Internet Explorer itself won't allow install of these add-ons.
Please note following problems:
1. Windows 8.1 64 bit operating system installs 32 bit Internet Explorer 11, but this 32 bit Internet Explorer won't accept 64 bit add-ons which I tried to install for 64 bit Windows 8.1, incompatibility of 64 bit and 32 bit which
I knew already but didn't clicked even on posting forum questions not before 'ORACLE's message in yellow.
2. For 64 bit Windows I kept on trying to install 64 bit add-ons for Internet Explorer, which won't install or would send message 'Incompatible', once default installations of these add-on's are disturbed but not completely uninstalled, new installations
won't be entertained at all, only way is reinstall of Internet Explorer.
3. Therefore I installed Apple's 'Safari', which also displayed same messages, but allowed install of 'Quick Time', and now I listen to my favourite songs on a great sound system of a website.
4. Windows needs correction for this.
Best of Luck.
Use the 32-bit version of IE. All rivals are 32-bit, no need for x64, a browser is not so big.
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It's truly way bigger, handles much more memory, therefore should switch on x64 bit.