Learned something new today, even more thanks for that!
Here's the final code snippet should anyone stumble upon this thread in the future.
#Input .obj namename='SM_Floor_3x3_01_High'#Path where the .obj is locatedhighStart='S:/Jona_Marklund/_P3/Sculpts/'#Path where the .fbx is to be savedlowStart='S:/Jona_Marklund/_P3/Low/'#ExtensionshighEnd='.OBJ'lowEnd='.fbx'#Build the final .obj pathhighPath=highStart+name+highEnd#Remove "_High" to follow the naming convention of the projectname=name.replace('_High','')#Build the final .fbx pathlowPath=lowStart+name+lowEnd#Get the input file node for .obj inputfileNode=hou.node("../file2")#Get the rop_fbx node for .fbx eportfbxNode=hou.node("../rop_fbx1")#Set the "file" paramater to final pathfileNode.parm("file").set(highPath)#Set the "sououtput" paramater to final pathfbxNode.parm("sopoutput").set(lowPath)#Test strings#print highName#print lowName