Adobe Premiere supports many file multimedia file types for both import and export so it is very likely you can export your projects (.prproj) to standard AVI format using the default export function, i.e. achieve prproj to avi conversion. This may require the original multimedia source though.
As far as we know, no other program can be used to work with .prproj files, so Adobe Premiere remains your only choice.Open PRPROJ file Open AVI file
A timeline-based video editing software from Adobe
Mac version of Adobe's prime video editing software