Or - you could simply cast the result by starting your math with a number:
 Code:
0 + GetFileSize('file1') + GetFileSize('File2')
This "introduces" the first value as a number (integer in this case, but could be a double if you use 0.0 instead), causing the entire expression to be handled as arithmetic, rather than string concatenation.

This is a simple trick in Kix, which implies "CInt(GetFileSize())". Tricks like this can simplify code and even speed things a bit, but really deserve a comment to describe what's happening, since the result is less obvious than using explicit CInt or CDbl functions.

Glenn
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Actually I am a Rocket Scientist! \:D