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I think I solved this. I had desktop and start-menu shortcuts to the Windows 7 system drive instead of the virtual XP Mode system drive. Deleting the shortcuts, copying the setup file to the XP Mode system drive, and installing Textpad from there seems to have fixed the problem.

Textpad 7.09
When I right-click a file name in Windows 7 Pro x64 Explorer, the context menus includes Textpad. When I click on Textpad there, it starts Textpad and opens the file for editing. That is normal operation.
When I do the same in XP Mode, nothing appears to happen. I can edit the file by ...

Undo might have had something to do with it but I am not sure because I did not get any notices about running out of memory.
As an experiment I doubled my pagefile size and re-ran the editing session. It was to rearrange a 27MB 310K line file so that side-by-side pages about 60 lines each were made ...

How large a block should be copyable? While editing a large file (about 950K lines) using columnar block mode in Textpad and insert mode in the computer, I could not copy blocks (about the left-hand half of the lines) larger than about 350K to 400K lines. I worked around it by dividing the file into ...