One point here could be, that I should setup the file associations on a 32-bit system so that the .mframe and .viframe files always open with the 32-bit version.
However, as we discussed in the other thread, I think I will rather revise this a bit - and change the file format names to .mframe32 / .mframe64 - and these will automatically open with the proper architecture. This should be the most universal solution, and should also allow one to distinguish between files created by the various architectures, not to mistakenly try to load a 64-bit mframe in a 32-bit version (which could easily overflow memory).
Thanks,