prerm is in fuse-emulator-gtk 1.0.0.1a+dfsg1-1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
set -e
update-alternatives --remove fuse /usr/bin/fuse-gtk
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