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On 4 May 2013 07:48, Nick Coghlan <ncoghlan@gmail.com> wrote:

We don't need examples of arbitrary data file extentions, we need
examples of 4 letter extensions that are known to work correctly when
placed on PATHEXT, including when called from PowerShell. In the
absence of confirmation that 4-letter extensions work reliably in such
cases, it seems wise to abbreviate the Windows GUI application
extension as .pzw.

I've also cc'ed Steve Dower, since investigation of this kind of
Windows behavioural question is one of the things he offered
distuils-sig help with after PyCon US :)

Nick, thanks for passing this on. Your explanation of the issue is precisely correct. For information (I should have included this in the original message) here's the Powershell bug report I found:

https://connect.microsoft.com/PowerShell/feedback/details/238550/power-shell-trimming-extension-to-3-characters-when-resolving-file-associations

Unfortunately the link to the referenced discussion in that report is inaccessible :-(

Paul