centos7
tar -zxvfでtar.gzファイルを解凍しようとすると

gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error is not recoverable: exiting now

とエラーが出てきてしまいます。
p7zip入れて　7za xをやっても

7-Zip (a) [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
p7zip Version 16.02 (locale=ja_JP.UTF-8,Utf16=on,HugeFiles=on,64 bits,2 CPUs Intel(R) Pentium(R) CPU G3258 @ 3.20GHz (306C3),ASM)

Scanning the drive for archives:
1 file, 17782 bytes (18 KiB)

Extracting archive: poi-bin-3.16-20170419.tar.gz
ERROR: poi-bin-3.16-20170419.tar.gz
poi-bin-3.16-20170419.tar.gz
Open ERROR: Can not open the file as [gzip] archive


ERRORS:
Is not archive

Can't open as archive: 1
Files: 0
Size: 0
Compressed: 0

と出てきて解凍できません。。。