subprocess decoding?

[MC]

Hi!

On win-XP (french), when I read subprocess (stdout), I must use 
differents decoding (cp1252,cp850,cp437, or no decoding), depending of 
the "launch mode" of the same Python's script:
  - from command-line
  - from start+run
  - from icon
  - by Python-COM-server
  - etc.

(.py & .pyw can also contribute)


How to know, on the fly, the encoding used by subprocess?


Thanks by advance

-- 
@-salutations

Michel Claveau