I'd like to thank you everyone here.... I was able to get my pdf reset to back to where it was like before I accident hit the pdf to set as a file asscioate with the dBase file....
Well I was able to get that fix and I just went into this site:
https://www.google.com/search?q=file+type+change+back+to+unknown+application+windows+10&sa=X&ved=2ah...
I was able to open it in ArcCatalog and make sure it can read it. Yes it reads it just like exactly what you see it .
Here is the screenshot.. I havehighlighted as yellow color to show it to you...