The PdhAddCounter function, witch is used in the Agent to query PerformanceCounters will expect on a german OS a german Index.
Since 2008/Vista there is also a Function "PdhAddEnglishCounter", which will work also with english-Indexes.
So there sould be a check, if OS newer than xp/2003 there should be a fallback to PdhAddEnglishCounter.
The "PdhValidatePath" makes no sense and can be removed, in my view.
Affected file: perfmon.c
With this Feature, there is no need, to create windows-templates for each language.