When I created a custom report for a client from AR, I used the ARW10 data definition.
When I brought the report in to my office to tweak it, I had a problem as my office PC has only had AR 9.0 installed and the tables available are only ARW90.
Even though the clients has upgraded to AR 9.0 this old report works, but I can't modify it on my PC as it doesn't have the ARW10 data dictionary.
How do I get the ARW10 dictionary on my system without having to install all old versions?

The file you are missing is called QRTARW10.QRW and is located in the \QRASP folder. If you can grab that file from your client or from some other installation, that would work.