Now i just remember, in the past i have used xpress tool text to mtext alot on older drawing created with dtext. And now i wonder where some of the letter "P" are gone.
That exactly what happen when convert dtext string "Abc\P1" = "Abc\1"
This will happen with many strings - any string that contains the equivalent of MText formatting codes, which are not prefixed with backslashes to mark them as literals.
For example, create DText with the string:
C:\Computer\LISP
Now use the TXT2MTXT Express Tools function on that DText.
I describe this behaviour in more detail
here.