@PoojaGadige I did ... that is not helpful. I see two ways of doing this ... 

(1) use custom stream processing for a File DataSet ... 

https://docs-previous.pega.com/decision-management/87/requirements-custom-stream-processing-file-data-sets

an example that assumes a fair bit of knowledge of how Pega Implements InputStream, but would just convert they byte array from 16 to 8 on they way in ... 

OR

(2) use the pega Data Pages on Embed-Repository-File, read the UTF-16 file as input and write to a UTF-8 file as output ...  which will involve using Java Steps that will of course violate the Guardrails Pega puts in place ... 

this seems less invasive to me ... just have to figure out how to intercept the Stream and provide the conversion ... 

I plainly have the stream, just need to figure out where to insert the conversion of it ...

READ a file.... 

step page 

D_pxGetFile[repositoryName:Param.RepositoryName,filePath:Local.FilePath,responseType:"STREAM"]

Java Step

java.io.InputStream FileData = (java.io.InputStream)myStepPage.getObject("pyStream"); tools.getParameterPage().putObject("FileDataStream",FileData);

Initialize a NEW file ... 

step page 

D_pxNewFile[repositoryName:param.RepositoryName,filePath:local.TargetFile]

Java Step

tools.getStepPage().getProperty("pyStream").setValue(tools.getParameterPage().getObject("FileDataStream"));

Save the NEW file ... 

step page 

D_pxNewFile[repositoryName:param.RepositoryName,filePath:local.TargetFile]

Save-DataPage   D_pxNewFile     Param.RepositoryName     local.TargetFile

if this was native java its easy to either convert the file or convert each line as a byte array ... 

if you had direct access to the files you would just use normal file I/O

Reader in = new InputStreamReader(new FileInputStream(infile), "UTF-16");

Writer out = new OutputStreamWriter(new FileOutputStream(outfile), "UTF-8");

char cbuf[] = new char[2048];

int len;

while ((len = in.read(cbuf, 0, cbuf.length)) != -1) {

    out.write(cbuf, 0, len);

}

or if you read a file you could convert it line by line using byte arrays

String str = new String(bytes, 0, len, "UTF-16");

byte[] outbytes = str.getBytes("UTF-8");

...

OutputStream out = new FileOutputStream(outfile);

out.write(outbytes);

out.close();