Document cannot be opened because it is either not a supported file type or the file has been damaged

Hi All,
I would appreciate if you can help me with this problem. I used to be able to access all my pdf files, but now I can't and this is the error message I get on them.
I tried the registry editor to create a bValidateBytesBeforeHeader solution, but either it is not the solution to my problem, or I'm not doing it right.
I would really like some help from you guys so that I can get my files to work.
Thanks

girisht97034793, just a little extra note. There are several possible causes of "file corrupted". These include
* The rules for PDF being tightened up. This is what the bValidateBytesBeforeHeader solution is about. This is NOT the problem here.
* File was a PDF, but got damaged, for example by a faulty disk. Could be this, probably not.
* File never was a PDF. Often, we can see what the file really is. But I can't see that this file is any other kind of valid file.
* File was damaged by a virus or "ransomware". Perhaps this is the problem here.
* File was encrypted. But usually you'd know about this going on.
Anyway, this is just confirming what ~graffiti says, but I'd done the research before replying but I thought I'd share. He has excellent questions.

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I would save as PDF and when I go to open it is blank and I get the message above.

Back up all data before making any changes. Please take each of the following steps until the problem is resolved.
Step 1
If Adobe Reader or Acrobat is installed, and the problem is just that you can't print or save PDF's displayed in Safari, you may be able to do so by moving the cursor to the the bottom edge of the page, somewhere near the middle. A black toolbar should appear under the cursor. Click the printer or disk icon.
Step 2
There should be a setting in its preferences of the Adobe application such as Display PDF in Browser. I don't use those applications myself, so I can't be more precise. Deselect that setting, if it's selected.
Step 3
If you get a message such as ""Adobe Reader blocked for this website," then from the Safari menu bar, select
          Safari ▹ Preferences... ▹ Security
and check the box marked
          Allow Plug-ins
Then click
          Manage Website Settings...
and make any required changes to the security settings for the Adobe PDF plugin.
Step 4
Triple-click anywhere in the line of text below on this page to select it, the copy the selected text to the Clipboard by pressing the key combination command-C:
/Library/Internet Plug-ins
In the Finder, select
          Go ▹ Go to Folder
from the menu bar, or press the key combination shift-command-G. Paste into the text box that opens by pressing command-V, then press return.
From the folder that opens, move to the Trash any items that have "Adobe" or “PDF” in the name. You may be prompted for your login password. Then quit and relaunch Safari.
Step 5
The "Silverlight" web plugin distributed by Microsoft can interfere with PDF display in Safari, so you may need to remove it, if it's present. The same goes for a plugin called "iGetter," and perhaps others—I don't have a complete list. Don't remove Silverlight if you use the "Netflix" video-streaming service.
Step 6
Do as in Step 4 with this line:
~/Library/Internet Plug-ins
If you don’t like the results of this procedure, restore the items from the backup you made before you started. Relaunch Safari.

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Hi There
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Regards,
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