First you need to know that XYplorer needs a 32-bit preview handler for PDFs installed in the system. The popular PDF software from Adobe usually fails to install this while preventing competing software from working. But nothing is lost.
If the PDF preview does not work out of the box in XYplorer any of the following usually helps (tested in 64-bit Win 10, 8.1, 8, 7):
Now, after a reboot, PDF preview in XYplorer should work just fine.
Now if Abobe Acrobat is still installed on your system it will likely prevent PDF-XChange from working normally. Your company usually won’t allow you to do the right thing (uninstall Adobe), but there is still a way to make things work even with Adobe Acrobat around: XYplorer (v18.00 onwards) allows you to set up User-Defined Preview Handlers.
Here is what you do step by step:
Now PDF preview in XYplorer should work just fine.