The reason: There is a 32-bit plugin for 32-bit TCC which does not exist for 64-bit TCC.
Projected use from within 64-bit TCC: set result=%@execstr[tcc32 /c "echo %@pluginfunction[foo bar]"]
or tcc32 /c "echo %@pluginfunction[foo bar] > temp.txt"
Projected use from within 64-bit TCC: set result=%@execstr[tcc32 /c "echo %@pluginfunction[foo bar]"]
or tcc32 /c "echo %@pluginfunction[foo bar] > temp.txt"