explorer: Use comma as argument delimiter.

[Sergey Guralnik]

It seems like explorer.exe allows spaces in unquoted
arguments, and delimits its only by commas.
For example native explorer correctly handles next:
  explorer .\file 1.ext, .\another.ext
when builtin says something like "couldn't find ".\file""
Another example (and more important IMO) is that
builtin explorer can't open single file if its name
contains spaces and is unquoted:
  explorer spaced file.ext
Native one opens "spaced file.ext" correctly but
builtin fails.
Some applications uses this feature for opening different
documents, but can't work properly due explorer behavior

---
  programs/explorer/explorer.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-
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