So this is just one file? If it isn't the picture size & tracking is turned off then I don't know. 18 mb is large for word doc file. I still think that it is the pictures. Try creating a copy of the file by clicking once on the file, hitting ctrl & c at the same file, & then ctrl & v at the same time. The new file should say copy of whatever it is called.doc. Open this file & delete all of the pictures & then save the file. Now look at what the file size is.

I don't know anything about total commander. Try having windows tell you what it is. Click once on the file & then right click with the mouse. A menu should pop up. Click on properties. Here you can see what the size is.

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