Hi, Welcome to the Forum ushybiscushear !
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Filetype .h2song is not a supported type. I think LMMS attempt to parse it as a MIDI-File, and then LMMS crash!When I try to import a file from Hydrogen (.h2song) windows closes lmms.exe I have no idea what to do.
I have to admit, that i do not know the structure of a .h2song-file, but you cant load it in current LMMS. Only MIDI-Files can be imported, and only MMP, MMPZ and BAK files can be directly associated with LMMS, eg open the program, with a double-click on a file of those types.