Extension is not installed

[Phi]

I'm trying to open a file using an extension which can be dropped and used freely in new applications. But opening a particular MFA gives me this:


It's not in blocked extensions, and it loads fine in a blank program. I also removed a mfx file with a similar name just in case the two were conflicting. Even DllMain() isn't executed during the load; there's a first-chance CFileException (once), then subsequent attempts to load don't even throw that one.

I'm at a loss. Surely there'd be a different error message if it existed but couldn't be accessed. I attached the extension if you guys want to test.
DebugObject.zip

[LB]

Opening a particular MFA? Are you sure it's not corrupt?

[Phi]

Yes, it's not corrupt, none of the 100 auto-backups work either. Just one day, poof, this error.

[LB]

What I mean is, do new MFAs you save have this problem?

[Phi]

Good catch, but no, they save and load fine.

[LB]

If new MFAs do not have the problem, but all your backups of that one MFA do have that problem, then you have probably just made a change that causes your extension to be compatible with all previous versions. Do you know what you might have changed to cause that, or at least when?

Also, make sure to clear out any extra duplicates of old versions of the MFX - often times old Unicode or HWA versions remain and MMF2 for some reason has inconsistent priorities for which MFX it loads. This happened to me and was very frustrating.

[Phi]

Nope LB, I have no idea what would cause the problem. I haven't removed any a/c/e, and it should be a complete match to an old version otherwise - at the very least, one of the 100 autobackups would be using a compatible version.

[LB]

it should be a complete match to an old version otherwise

So you rewrote it with another SDK?

[Phi]

No, same SDK consistently.

[LB]

Did the version of your compiler change at all?