[Malatesta]

This is a free plugin from SurrealNetworks (who's site is down currently, dunno why).

It definitely works on the Smartphone platform and I bet for PPC PIE too (though if someone can verify?). Here's what it enables for downloading in Internet Explorer:

.aac - Advanced Audio Codec File
.doc - Word Document **
.exe - Executable File
.nes - NES ROM File
.mp4 - MPEG Layer 4 File
.mpg - MPEG Video
.mov - Quick Time Movie File
.ogg - Ogg Vorbis File
.pdf - Adobe Portable Document Format **
.pps - Power Point Show **
.ppt - Power Point Presentation **
.rar - RAR Acrhive
.xls - Excel Spread Sheet **
.zip - ZIP Archive

** Requires proper reader software such as Clear Vue Suite.