This question is related to another one which went the perl way but found much difficulties due to Windows bugs. (see Perl or Powershell how to convert from UCS-2 little endian to utf-8 or do inline oneliner search replace regex on UCS-2 file )
I would like the POWERSHELL equivalent of simple perl regex on a little endian UCS-2 format file (UCS-2LE is same as UTF-16 Little Endian). ie:
perl -pi.bak -e 's/search/replace/g;' MyUCS-2LEfile.txt
You will probably need to tell Powershell gci that input file is ucs2-le and that you want output file in same UCS-2LE (windows CR LF) format also etc.