I just installed Trilian (both version 32 & 64-bit), Reaper scan my <vstplugins> folder but can't detect it. Sonar 8.3.2, Cubase 4, Nuendo 4 etc... detect it no problem. Otherwise, Reaper doesn't have any problem with Omnisphere, Stylus RMX.
It happens to both version Reaper 32 & 64-bit.
OS-Windows 7 64-bit
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DarkStar
... interesting, if true.