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All command line options are case sensitive, file names are not:

• "File Name 1" "File Name 2"
  opens the specified file(s). If no full path is specified the file(s) must reside in the same directory as the program
• /p "Image Name"
  opens the image in print preview mode
• "Image Name 1" "Image Name 2" /pt "Printer Name" "Driver Name" "Port Name"
  prints the given image(s) to the optionally specified printer. If no printer name is specified the program's default printer is used
• /slideshow
  is used to start the program in slideshow mode, the same can be achieved by renaming the program to Start.exe. In this mode the pictures located inside the program's directory will be opened and showed in full-screen one after the other
• /play "File Name"
  to start playing an audio or video file
• /close
  to close the program right after audio playing is done
• /hide
  used to hide the program window while playing an audio file (use this switch together with the /play and the /close switches)
• /extracthere "File Name"
  is to extract the given zip file to the zip file's directory. A subfolder is created if multiple files or folders are inside the zip archive