Yes it does have Adobe Reader. It is this which the Web Browser control used to render the .PDf images. I assume the Edge Browser control uses it also. I've tried changing the windows default pdf reader. It doesn't make any difference. Historically we've always had Adobe Reader as the default...
This is production database for an engineering company. I started writing it in 1994 using Access 2. We've gone through several versions of Access and we've now been on Access 365 for several years with a SQL Server back end. It's worked well and I could usually fix problems myself until January...