Avira says that convertall-dos and convertall are infected with TR/Crypt.XPACK.Gen2 - Trojan
False positive?
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I got the same (false) positive, but only 2 of 41 virus scanner (online virustotal) got a hit. So it seems to be caused due to file compressing.
Workaround: You can make avire always ignore these files but i prefer the download of convertall from the original site (not portable) and exchange both files with the uncompressed ones.
You can do that, or you could download upx and decompress the files in the PortableApps package on the command line with the following command:
Cancer Survivors -- Remember the fight, celebrate the victory!
Help control the rugrat population -- have yourself spayed or neutered!