IBM Support Assistant Out Of Memory when opening heapdump .phd file

I am using IBM Support Assistant 5 on my local machine. I am trying to open a heapdump file (.phd) file that I have grabbed from the server where I've had an out of memory error and copied it to my local machine. The file size is 915 MB.

Inside IBM Support Assistant I am using the Memory Analyzer tool (desktop). When I launch this tool there is a screen which allows you to specify the min heap and max heap. I have played around with trying to increase the maximum heap size from 1024 to 7500 but no matter what I do with these settings I get an outOfMemoryError in the tool after it spends x minutes trying to parse the heap dump.

I am running Windows 7 with the following JVM.

java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) Client VM (build 25.51-b03, mixed mode, sharing)

The heapdump was created on a WebSphere 6.1 server.

Can someone please suggest to me a way that I can work through this so as to be able to open and analyze the heap dump.

If you have trouble running memory analyzer from ISA, you can download and run standalone version - Heap dump analyzer