[Anders]

Moving to something other than LCIDs (LANGID technically) would require a change to the translation format and code changes in the installer.

LOCALE_CUSTOM_UNSPECIFIED seems OK initially but GetLocaleInfo(LOCALE_IDEFAULTANSICODEPAGE) returns an error, who knows how much of a problem that is.

LOCALE_CUSTOM_DEFAULT and 0x2000 seem to work better but I assume can return strings/data in the wrong language sometimes.