Can't open large maps using Memory-Map

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I have a problem opening large maps using Memory-Map V5. Forgive me for asking this question again. I know that has been asked elsewhere on this site but it seems to remain largely unanswered. I suspect that is because it has been posted in device specific forums thus may not have come to the attention of someone who can provide an answer, hence I thought it worth posting here. Additionally it appears to work differently between WM 6.1 and WM6.5 This has not been posted before and may provide the key to solving this.

Using Memory-Map on my Wizard with WM5 everything worked fine.

When I upgraded the Wizard to WM6.1 it would sometime load the full size map and sometimes it wouldn’t. The error message was “could not open file "\storage card\memory-map-os\qct\os50_disk04.qct". Sometimes I could re-load the map from the PC and it would work until I switched to a smaller map on the storage card then it wouldn’t re-open the full map. Quite honestly I thought the Wizard had some sort of corruption and didn’t realize this was an issue that other people experienced.

When I bought the Touch Pro it was running WM 6.1 and it wouldn’t open any map over say 100 Mb. I’ve now flashed the Touch Pro to WM 6.5 and it will load the full UK road map at 126Mb and any section of a map up to about 130 Mb.

I don’t understand why WM 6.5 seems to be able to handle a slightly bigger map file than WM 6.1 but hopefully this will help someone provide an answer to this problem.