Some plugin vendors did not care about identical plugin identifier / filename naming. So even if a plugin is available for cross platform, you will be maybe run into an error, plugin is not found.
Let's take for example MDA DX10. It's available for all OS, but the naming is "mdaDX10" in Windows. You can fix this for Mac by
1. Extracting song contents. Add a ".zip" to the song and double click to extract.
2. Go to the song folder and open song.xml in a text editor. Replace all "mdadx10" with "mda dx10". You can get the required name by looking into /Library/Audio/Plugins/VST. The name needs to be identical like the filename minus ".vst".
3. Save XML and repack the song as zip directly in the folder (without the outer folder). Remove .zip and open it in Renoise.
Edited by Jurek, 17 November 2014 - 16:37.