I want to be able to access a word file in the sdcard of the user\'s phone, and the file will be chosen by the user. I want to be able to process the file, i.e. read its con
I am not sure but what I understand is that what you want is to be able to be sure a file is a word document without simply looking at the extension.
I think word documents have a file signature (see this link)
The file signature is in that case a OLE Compound File format having the following binary in header position
d0 cf 11 e0 a1 b1 1a e1
So checking the corresponding bytes should say if it is a word document or not. Be careful, I am not sure if the binary is specific for word, doc or docx or available to all microsoft office : powerpoint, excel, word.
You should perhaps search around the web for "microsoft word document file signature". This will certainly give you the information you are looking for.
Now, how to "edit" it is another question.