There is definitely something and it is cumulative. Whenever I closed mIRC and opened the two lines were added. I think the best way might be to have some scripts with the ON EXIT event testing perhaps the same /save -rv command.

[variables]
Content type: text/html; charset=
Content-Type: text/xml; charset=u
n0=
n1=u
n2=
n3=u
nX=...
nY=....