Check which process has a .myapp file open, as root:
lsof | grep -i myapp
This may give you a clue.
If not, then investigate a little more, check what type of file is it:
file 51b9dc4cc246f.myapp
If it's text just open it with less. If not use strings to see if it has anything readable in it:
strings 51b9dc4cc246f.myapp | less
If that doesn't get any clue, i'll bet to leave a loop running, preferably in a screen session with the lsof command, every minute or less
while [ true ]; do lsof | grep -i myapp; sleep 30; done
Good luck!