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I'm programming some vintage tracker, which should be able to export .mid format.
Currently, some tools like cubase5 fully understand my .mid, but midiox complains and samplitude x3 crashes.

Is there a tool/way to check the compliance of a .mid file versus the standards ?

There is some more low-level tools, like https://github.com/markc/midicomp and m2t, midi to text, which show midi events and file structure. Especially midicomp i find convenient for such. It doesn't validate, but you get to compare with "known good" files.

Edit: btw, have you tried Radium? I've been using this for some time now. Runs on PC/Mac/Linux. Video on someone's workflow with it.