Miranda 0.6 ;)

you can simply start upx -*parameters* *.*

upx will decide, if it can handle the file, or not and skip all other files, like *.jpg.

with the following method i pack all files on my portable device:

1. put upx.exe in root directory
2. create a text-file, name it upx.bat and open it for editing
3. my upx.bat:

FOR /R "PortableApps\" %%a IN (*Portable.exe) DO ATTRIB +R "%%a"
ATTRIB +R "PortableApps\PortableAppsMenu\PortableAppsMenu.exe"
ATTRIB +R "PortableApps\PortableAppsBackup\PortableAppsBackup.exe"
ATTRIB +R "PortableApps\PortableAppsBackup\PortableAppsBackupRestore.exe"
ATTRIB +R "PortableApps\RSSOwlPortable\App\RSSOwl\rssowl.exe"

FOR /R "PortableApps\" %%a IN (*.exe *.dll *.sys) DO upx.exe --best --compress-icons=0 --nrv2d --crp-ms=999999 "%%a"

FOR /R "PortableApps\" %%a IN (*Portable.exe) DO ATTRIB -R "%%a"
ATTRIB -R "PortableApps\PortableAppsMenu\PortableAppsMenu.exe"
ATTRIB -R "PortableApps\PortableAppsBackup\PortableAppsBackup.exe"
ATTRIB -R "PortableApps\PortableAppsBackup\PortableAppsBackupRestore.exe"
ATTRIB -R "PortableApps\RSSOwlPortable\App\RSSOwl\rssowl.exe"

4. explanation: first row sets write protection on all portable launchers by john, because after using upx, they will by corrupted
next lines do the same on special files, same reason
the next "for" line starts upx recursively to all *.exe, *.dll, *.sys and pack them. *.* would also work, but it was to slow for me :-)
and next i remove write protection

i hope you enjoy :-)