If the user wants to open a file, there is a list with filters reading:

LyX Documents (*.lyx)
LyX-1.3.x Documents (*.lyx13)
LyX-1.4.x Documents (*.lyx14)
LyX-1.5.x Documents (*.lyx15)
LyX-1.6.x Documents (*.lyx16)

This might be rather confusing for users that switch to LyX 2.1 from LyX
2.0 and want to open their LyX 2.0 files.

Would it make sense to add LyX-2.0.x Documents (*.lyx) ? Or something else ?

Vincent

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