I believe those are either Maya or 3DSMax files. My best, and entirely uneducated, guess is that tx is likely a texture file and dpc is some sort of data file. Neither of which Daz takes, if I'm not mistaken. You'd have to open the native software and likely export as something like an OBJ file.
Stuff like clothes and hair that aren't specifically made for Daz, I'd recommend against using. As stuff like clothes or hair are often rigged and made specifically for Genesis figures. I'd imagine it's a fair bit of work, especially for someone who isn't experienced in it.