Could anyone please suggest a vendor/supplier to be able to get a quality FOREX historic data (30-40 years worth of data) to be used in back testing. The platform it will be used will be NinjaTrader.

give me the specifics

what currency pair(s)
what bar length
how far back

i can shoot you some spread sheets which I'm sure can be imported

or

Are you asking about data feeds???

Thanks for the advice provided on the earlier thread. Please see more information below.

The data should be daily with close, open, high and low information. I am looking for data that goes back 30-40years.

Currency pairs are more than 20 inclusive of most traded majors as well as crosses.

The plan is to be able to go back and test an automated strategy. I am looking for a professional vendor whom had a track record of supplying reliable historical data. I believe that few errors on the historical data could easily skew actual results significantly. Therefore, It would be much appreciated if someone could share a reliable vendor who could provide above for NinjaTrader Platform.

I suggest there are many online sites which are providing these data. You will surly find it online.