can't use the printer driver configuration tool

I can only guess your pdf.pltcfg has been edited with some invalid text. You could try opening it with notepad, from Windows, see if you can find those changed entries. Or get a clean copy.

Clean copy. I'm guessing I just broke a rule, oh well.3704.pdf.pltcfg

I can only guess your pdf.pltcfg has been edited with some invalid text. You could try opening it with notepad, from Windows, see if you can find those changed entries. Or get a clean copy.

Clean copy. I'm guessing I just broke a rule, oh well.3704.pdf.pltcfg

Thank you for your answer. I'm trying to edit the original pdf.pltcfg to change some settings. I made a copy of it and I haven't opened it with the notepad; I don't think the original was edited either, I had Microstation Connect recently installed on my machine. I've tried with the one you attached, but I get the same message. It looks like instead of opening it with the print driver configuration tool Microstation is trying to open it as a drawing file...

Now I also get a system window displaying the following message: Error expanding variable MS_LIBRARY_PATH.  Exiting.

Do you have this variable defined MS_PLTFILE_EDITOR

Fully qualified name of a text editor to use when the print dialog's 'File / Edit Printer Driver Configuration' menu item is activated. For example, set the value to 'notepad.exe' (without the quote marks) to use the Windows notepad text editor. If this variable is not defined, the print dialog automatically chooses the correct editor based on the printer driver configuration file format. Legacy .plt files are edited using notepad, while .pltcfg files are edited using the built-in Printer Driver Configuration Editor. There are two reserved values for this variable:
'HIDE_MENU_ITEM': Removes the Edit and Reload Printer Driver Configuration menu items from the print dialog's file menu.
'Builtin': Always use the built-in Printer Driver Configuration Editor.

Thank you for your reply. How can I define the variables and what's the defined tool to open the .pltcfg files?

I haven't changed any default configuration of the program so far.

Go to <File <Setting <Configuration <Configuration Variables. In the list in the right pane locate the variable MS_PLTFILE_EDITOR. It should be undefined.

We need to verify this variable before we go any further.

Also, can you post your pdf.pltcfg to see if we are able to open it with Microstation's editor on our pc?

Thanks, it helped me much. The MS_PLTFILE_EDITOR was defined "Microstation". I changed it to "Builtin" and now when I go to File> edit print driver configuration tool on the printing window it opens the selected one with the configuration tool.

However, I can't save the system configuration because it's asking me for administrator permission as my computer is managed by the company. Does it mean that I have to edit it every time I run Microstation?

Here you can find my pdf.pltcfg in case you still want to inspect it. 

8420.pdf.pltcfg