I'm about to use the buffer on my Vista partition and I'm doing everything to get rid of it. Basic4PPC is the only thing left that requires it and if I could run it in Linux (even if it doesn't allow testing), I'd be in heaven.
Since Basic4ppc uses the .Net Framework, there is no way running it "directly" under Linux.
I'm not a Linux-User for myself but maybe can get it run using "wine", a virtual (windows) machine or just give the mono-project a chance...
Wine won't work as it is a Win32 emulator and doesn't support the .NET Framework. Mono won't work (I've run its migration tool) as Dbasic.exe on the desktop uses P/Invokes to the Windows OS that aren't present on Linux so basically there is no solution I'm afraid.