When I run this from Kix, STDERR reports
 Code:
'C:\Windows\System32\manage-bde.exe' is not recognized as an internal or external command, operable program or batch file.
The error is not reported when run directly from the command line.

One thing to consider - Kix is a 32-bit app, and the Shell command calls the 32-bit shell environment via SYSWOW File Redirection. It's possible that the command won't run there. I've encountered this before and I recall there's a workaround.. I'll need to go dig into the code that I wrote.

Glenn
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Actually I am a Rocket Scientist! \:D