Find text in Word document

Hi all,
I try to find keywords in a Word document without opening the doc.
I use the following code

Open sFile For Binary As iFile
sBuffer = Space$(LOF(iFile))
Get #iFile, , sBuffer
Close iFile

Then I search with
If InStr(1, sBuffer, sKeys(j), vbTextCompare) > 0 Then ...

However there are some keywords I cannot find unless I do
sBuffer = StrConv(sBuffer, vbFromUnicode)
others I can only find if there is no conversion of the text

My workaround now is
sTemp = sBuffer
' Convert
sBuffer = StrConv(sBuffer, vbFromUnicode)
' Put together
sBuffer = sBuffer & sTemp

Is this the only way to do the search or am I missing something here
Thanks
Woolf