I assume you meant https://wiki.debian.org/QEMU. So, for example:
qemu -hda debian.img -cdrom debian-testing-i386-businesscard.iso -boot
d -m 256
translated to the language of current stable, means:
qemu-system-x86_64 -hda debian.img -cdrom \
debian-testing-i386-businesscard.iso -boot d -m 256
Basically, qemu-launcher merely run "qemu" with certain arguments,
which ceased to work once Debian stopped providing "/usr/bin/qemu"
executable. Which rendered the whole "qemu-launcher" unusable, and
since the maintainer was not able to fix the package - it was
rightfully removed from Jessie before the release.
The bug is still open, and as far as I can tell, the problem of this
package won't fix itself.
Reco