programs/explorer/desktop.c: Add error checking

[Vitaly Lipatov]

UuidToStringW from legacy (DCOM95) rpcrt4.dll returns RPC_S_CANNOT_SUPPORT, 
works only ANSI version.

Changelog:
Add return codes checking for UuidCreate and UuidToStringW

-- 
Vitaly Lipatov, ALT Linux Team
Russia, Saint-Petersburg, www.etersoft.ru
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