I'm using an evaluation version of a program that opens custom filetypes (a combination of text/midi like a karaoke helper). The evaluation version will only open certain files bundled with it. When I try to open a similar file, it will not load but throw a popup explaining that it cannot be opened in the evaluation version. It doesn't matter where the files are located. I'm trying to debug the executable so I get to where the load/not load decision happens.

So far I've used Spy++ and I'm able to break when I press the "Open" button when using the Open File dialogue. The dialogue .dll seems to be comdlg32


I've also tried to use the time machine and search for the filename string to get a lead, but I'm not sure at what time point I should perform the search.

How could I proceed with this?

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