#Compile time
!appendfile "$%temp%\compiletimefile.txt" ""
;Or if you need to force the file to be empty
!appendfile "$%temp%\compiletimefile.txt" ""
!delfile "$%temp%\compiletimefile.txt"
!appendfile "$%temp%\compiletimefile.txt" ""
#Run time, method 1
FileOpen $0 "$temp\runtimefile1.txt" w
FileClose $0
#Run time, method 2
File "/oname=$temp\runtimefile2.txt" "$%temp%\compiletimefile.txt"