Ask the Experts / Lost

This will probably sound stupid but I still need to know. I havnt played this for at least 2-3 years and im coming back to it. I went to download a few of the parks and some works but some showed up as unrecongnizable files, so I couldnt view some of them in game. Anyone know how to fix this id appreiciate it.
Thanks

which game are you playing?

rctLL files are .sv4, and rct2 files are .sv6.

also, if you're using LL, you'll need a few patches and whatnot. if you want it to work, follow posix' guide, pinned in the ask the experts area.