-v returns 'unknown' for Obfsproxy.exe from '2.4.17-beta-2-pt3'

obfsproxy.exe -v

prints out

unknown

It was included in 'tor-pluggable-transports-browser-2.4.17-beta-2-pt3_en-US.exe' and its (obfsproxy.exe) checksums are:

SHA-1: 8690778C86542ABC3596C65EF42903E943C843A9
SHA-256: F75A997308B689335AEA9705BF7DF57EEA0636CB7C2EB7D75BCAC41389F0F84F
SHA-512: 89459D5189C2490C22FA63AC8509AEF8B7902B38174C73BB2902C57F73DFAFC4EC42B1C361ADDBEB019D7709882589594D94FD264FD20A2712592326596B1107

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