How upload a text file?

I have a txt. file that I want to load into my script. I imported this txt.file as a matrix i all my script worked. However, i tried to run my script in another computer and it did not work. Is there another method to import a file that will always available?

% The function "save" is used to write data from the matrix imported

% (dataPS2)to a data file (vardata.dat)

% Then, that data file is loaded

save vardata.dat dataPS2 -ascii

load vardata.dat

Error in script (line 4)

save vardata.dat dataPS2 -ascii

[Walter Roberson]

The save would fail if there were no write access to the current directory.

[Walter Roberson]

Why go through this instead of just using

vardata = dataSP2;