<http://forum.pspad.com/read.php?f=6&i=3833&t=3761> 
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It works for me.
This depends of many things in your cmputer. If you run any program this
way, explorer runs as many program instances as many files you select.
First instance of the PSPad must start and then other instances must send
filename to the first instance. If your computer is slow or you have
antivir, antispyware and other program what slows start, it will not work
There is a way - use right click and Send to menu. In this case explorer
runs only one program instance and send all files as parameters. 
Please don't ask me why. This is question for the M$ Windows designer.

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PSPad freeware editor http://www.pspad.com

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