Some help plz?

Hey forum, so im working on this mesh in 3dsmax and since im most likely a huge dumbass for being unable to find any proper 3dsmax tutorial for soase modding, i thought id ask here. This is what I've got so far, tell me if I forgot anything important:

- Created a model

- Placed in mesh points, took them from another model (named P001-Weapon-0, P002-Weapon-0 etc)

- Connected all mesh points to a single object named  rootpoint

- welded all vertices to eachother

- attached textures etc (original sins models)

- exported as XSI with some plugin that i found

- tried to ConvertXSI (ConvertXSI "model.xsi" "model.mesh"

got the following error out of CMD:

ERROR : XSIParse::ReadDotXSIHeader

ERROR : CXSIParser::Open

Failed to Open "model.xsi"

tried googling it, didnt give me anything at all... i think i forgot something important and im getting the feeling that everyone who reads this will be like HAHAHA amateur error, easy to fix...atleast i hope, thanks for reading neway.