Upspring invalid extension error

[bokan]

I am trying to export a simple unit from upspring as as an S3O, but I get an invalid extension error. The unit is 3 obj files from max and one UV mapped tga diffuse map. Anyone know what might be wrong?

[smoth]

type .s3o after file name.
???
Profit.

[Wombat]

i had same issue and i abandoned upspring for a while becouse of that, i find it highly confusing becouse i pick extension in another window.

maybe fix it, anyone ?