PDF Extension

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Posts: 3
Joined: May 13, 2024 - 20:50
PDF Extension

I was wondering if you or the software can extend the PDF Property Extension from 

.pdf to .pdf1

I keep by Acrobat different from my viewer using a different extension.

Posts: 1986
Joined: March 25, 2012 - 01:19
Re: PDF Extension

If you feel safe in using Regedit, then have a look at this registry keys:

KEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\PropertySystem\PropertyHandlers                    (x64)
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\PropertySystem\PropertyHandlers       (x86 on x64 system)

here you'll find a subkey for each file extension manager registered for Windows Explorer.

If you open the .pdf subkey you should find this content:

(default)   REG_SZ    {AEE2E439-D294-41D8-BE62-34D154070307}

where {AEE2E439-D294-41D8-BE62-34D154070307} is the GUID of PDFPropertyExtension property handler.

If you want to register it for .pdf1 file extension then create a new .pdf1 subkey and fill  it with the same content as the existing .pdf.

Or you can export .pdf key content (right click on .pdf -→ Export), save to .reg file, edit file content to replace .pdf -→ .pdf1, save .reg file and finally double-click the file to import it.

Posts: 3
Joined: May 13, 2024 - 20:50
Re: PDF Extension

Thanks for the quick response.

I had already tried your (x64) method thinking it should do it too.

Just to be sure I added the 2nd WOW one and rebooted.

Those don't work so there must be more to it.

Notes: Acrobat was installed originally as .pdf. 
I just created a .pdf1 and picked Acrobat as the default program to open it.

If I change the extension .pdf1 to .pdf, the metadata will reappear.

Any help would be much appreciated.

Attachments (Only registered users)
Test.jpg
Posts: 1986
Joined: March 25, 2012 - 01:19
Re: PDF Extension

You're right, there's also this key that defines the properties available for each extension:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\SystemFileAssociations\.pdf

You need to duplicate it to a .pdf1 key

Posts: 3
Joined: May 13, 2024 - 20:50
Re: PDF Extension

Yep, way ahead of you.

Tried that one too and a bunch of others.

Thought it would be easy but it isn't.

Appreciate the attempt.

 Going to give up unless someone has a surefire tested method.

Posts: 1986
Joined: March 25, 2012 - 01:19
Re: PDF Extension

I've found what's wrong: the extension applies two "validations" on each file:

  • filename must end with “.pdf”
  • file content must begin with PDF fingerprint “%PDF-”

The first one was added in the early ages to avoid opening unparseable files but… it's redundant.
Windows Explorer already calls the extension only for configured file extensions.

Attached here you'll find a version without that extra check; please test it and report any issue 😉

Attachments (Only registered users)
PdfPropertyExtension_1.16.3-beta1.zip
Posts: 1986
Joined: March 25, 2012 - 01:19
Re: PDF Extension

@Georgeshm, what about the beta I've published?

Have you tested it?