My little work around:

Code:
;This line tells mIRC to play data in clipboard into the command "noop"
;The reason I do this is to force mIRC to save the text in clipboard to a file
/play -bas noop 100

;This retrieves the qued play file that the clipboard text *should* be in[see bottom]
var %f = $findfile($mircdir,playq*.txt,$findfile($mircdir,playq?.txt,0,0),0)

;%f contains the file
;Do stuff with file

/play stop



Two know "bugs" with this:
1) If there is a file in your mIRC dir that matches playq?.txt it COULD mess the finding of the clipboard file up
2) this will stop ALL /play requests.