Oh, ok. I got it! Thank you Zappy! Even if the conversion is successful, the Shape key will still not work to enter the prepared model into SFM. I even checked Launch HLMV and the Shape keys on the backmost window worked except for the first two empty windows. How to make these Shape keys work normally on SFM? I thought it would be clear to you, so I sent a picture.
Link: https://imgur.com/a/EthBSvm

WARNING: 1337 verts on "Silco_mesh" have over 3 weight links. Source does not support this!
~ This error appears when converting with the .dmx extension. >.< But it worked without any errors when converting to .smd. How to fix this? Have you ever encountered this type of error when converting to .dmx format? Please help me with any advice on this, I would greatly appreciate it. ^ ^