If you're trying to go through VICEMENU.ELF, ignore that and try launching the main emulators (x64, x128, etc) directly, even though they're not named .ELF they're still standard ELFs.
Not sure about TAP images, but I know raw PRG, P00, D64, and T64 all work. I've not messed with any CFG files directly.
Chip-free/MC-free homebrew <3
FMCB 1.93 on MC for emergencies, NA
250GB HDD/FHDB 1.93/OPL 0.9.2 (GSM and non-GSM)/PS2 games, NO HDDOSD
80GB HDD/FHDB 1.93/POPStarter rev12/OPL644/GSM0.37/PS1 games, NO HDDOSD
SCPH-75001 (sitting idle, slims suck):
FMCB 1.92 on MC