Missing filename quoting in Windows Batch

File existence checks should use quotes in Windows (when the filename uses spaces). Currently

if (exists("file 2.txt")) {
  println("file exists");
}

compiles to

if exist file 2.txt (
  echo file exists
)

but it should compile to

if exist "file 2.txt" (
  echo file exists.
)

In fact, quoting file names is never wrong, so simply doing it always won't break stuff.

damn, two typos in the title, that's a sad record...

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