Single-file: Antivirus deletes extracted files

[swaroop-sridhar]

In .net core 3.x, Single file apps run by extracting the embedded contents within the %temp% directory. The extracted binaries have the exact same content (including code signature) as the original files themselves. However, some Antivirus applications still perceive the extracted binaries are threats and delete them -- thus causing the single-file apps to crash.

In particular, this behavior is reported for Semantec Endpoint Protection on Windows.
Please see the issues reported by @bignis and @hshristov in dotnet/wpf#2416

CC: @samsp-msft @jeffschwMSFT @lpereira

[swaroop-sridhar]

Not sure we can do anything about AV deleting extracted files.
.net 5 provides a solution to create single-file apps without extraction -- in some cases, this solution may generate "a few files" instead of a single file.
In .net 6, we should improve the current support for single files, and reduce "few files" to a "single file".