in reply to Pick up specific file name

Just specify the wildcard mask to glob: 
for my $filename (glob "$folder/*_0828900840_*D602BG") {

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BTW, Using <...> for glob is confusing and might break. See Angle brackets should not be used for file globbing.

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In Section Seekers of Perl Wisdom