Olympus E-M5 and E-M1 .ORF file compatability with ACR 6.7.1 in CS5.1 Extended

My apologies if this has been covered before but...
I own both the above bodies and the E-M5 .ORF files open using the last version of ACR ( 6.7.1) for CS5.1 Extended with no issues.
The E-M1 files are rejected as not compatible.
The E-M5 was launched in February 2012 - the E-M1 in September 2013.
I have searched long and hard for a solution to the E-M1 issue and can find no answer (The E-M5 is 650nm, IR-converted)
(I use DNG extensively on the E-M1 RAW files)
Thoughts??
I own both the above bodies and the E-M5 .ORF files open using the last version of ACR ( 6.7.1) for CS5.1 Extended with no issues.
The E-M1 files are rejected as not compatible.
The E-M5 was launched in February 2012 - the E-M1 in September 2013.
I have searched long and hard for a solution to the E-M1 issue and can find no answer (The E-M5 is 650nm, IR-converted)
(I use DNG extensively on the E-M1 RAW files)
Thoughts??

Unless you want to upgrade your version of Photoshop from CS5 or use a more recent version of LightRoom you are, I believe, stuck with doing a DNR conversion.
Having said that, there are some schools of thought that you should use DNG all the time to convert RAW files because of potential legacy issues going forward.
Having said that, there are some schools of thought that you should use DNG all the time to convert RAW files because of potential legacy issues going forward.

Thanks Roy. I do as I said. I have moved forward to using other products (DxO Photolab / Luminar 3) and only use PS for 'finishing'.
That said - I was shocked to come across this issue only this afternoon having just bought the IR-converted E-M5 today (the vendor sent me an original RAW file to check through my PP workflow) when I accidentally grabbed the .ORF file instead of the .DNG and dropped it into CS5.1 where it opened perfectly. It took me a couple of moments to realise what I had done - hence the question here.
For anyone interested, Luminar 3 is excellent across the board and is a 'god-send' for Infra Red post-production.
That said - I was shocked to come across this issue only this afternoon having just bought the IR-converted E-M5 today (the vendor sent me an original RAW file to check through my PP workflow) when I accidentally grabbed the .ORF file instead of the .DNG and dropped it into CS5.1 where it opened perfectly. It took me a couple of moments to realise what I had done - hence the question here.
For anyone interested, Luminar 3 is excellent across the board and is a 'god-send' for Infra Red post-production.