erlehmann_

  #!/bin/sh -eu
  printf 'data:%s;base64,%s' "$(file -bi "$1"|tr -d ' ')" "$(base64 -w 0 "$1")"

  #!/bin/sh
  redo-ifchange $2.c
  strace -e stat,stat64,fstat,fstat64,lstat,lstat64 -f 2>&1 >/dev/null\
   gcc $2.c -o $3 -MD -MF $2.deps\
   |grep '1 ENOENT'\
   |grep '\.h'\
   |cut -d'"' -f2 2>/dev/null\
   >$2.deps_ne
  
  read d <$2.deps
  redo-ifchange ${d#*:}
  
  while read -r d_ne; do
   redo-ifcreate $d_ne
  done <$2.deps_ne
  
  chmod a+x $3

  #include<stdio.h>
  main() {
   printf("hello, world\n");
   return 0;
  }

   * Add Enhances: caja, tumbler (>= 0.1.92~), nautilus, nemo
     These are some of the many file managers/thumbnailer programs that support
     desktop thumbnailers like exe-thumbnailer, and I have verified (at some
     point) that all of these work.