V. 07 close.

[EkBass]

I have been able to produce the lib mechanism and by small tests, it works.

' testlib.bas
DEF FN add$(x$, y$)
    RETURN x$ + y$
END DEF

DEF FN multip$(x$, y$)
    RETURN x$ * y$
END DEF

PS C:\Users\ekvir\source\repos\BazzBasic\bin\Debug\net10.0-windows> .\BazzBasic.exe -lib .\testlib.bas
Created library: C:\Users\ekvir\source\repos\BazzBasic\bin\Debug\net10.0-windows\testlib.bb
Library name: TESTLIB
Size: 260 bytes
PS C:\Users\ekvir\source\repos\BazzBasic\bin\Debug\net10.0-windows>

And usage with BazzBasic

INCLUDE "testlib.bb"
PRINT FN testlib_add$(1, 2)

PS C:\Users\ekvir\source\repos\BazzBasic\bin\Debug\net10.0-windows> .\BazzBasic.exe .\test.bas
3
PS C:\Users\ekvir\source\repos\BazzBasic\bin\Debug\net10.0-windows>

With few more tests and documentations adds, I think ver. 07 is released in few days. If all goes well.