I'm working on making additional planet types and need to resize the original meshes. What is the best way to import/export the default meshes?

I have tried using the import/export tool with Max, but that looses some of the vertex data (U1, V1). I have also tried editing the .mesh files--specifically, replacing the "Position [ x, y, z]" lines--but it's tedious work, and I'd rather not replace 2000+ lines by hand. (And unfortunately, my programming knowledge isn't good enough for me to automate the process.)

Does anyone have any other ideas? Are there any advanced text editors that make replacing certain corresponding lines in different documents easy?