Problems with packages/diffs showing NULs

I'm a new user to TortoiseSVN and I'm using it with TestComplete (automation tool similar to HP QTP). The script files are *.sj but are just plain text files. TortoiseSVN was treating them as binary so when I created a package, it wouldn't report the diff. (I still don't understand that since I can see diffs from the Commit dialog so maybe I'm just missing something obvious?) So... to attempt to remedy this, I changed the mime-type (of every file individually, ugh!) to text, created a new patch with some simple changes, and now I can see the diff (kinda) but every other character is some NUL (?) character which makes it impossible to read.
I can open the *.sj files with Windows Notepad so I know they are text of some flavor. Maybe they are encoded a certain way and that's causing the issue? I'm not sure how to proceed.
I've attached a sample *.sj file and a screenshot of the patch diff so you can see the issue.
Here are my questions:1. How do I solve the NUL character in the patch diff issue?2. How can I set up TortoiseSVN so that all *.sj files are treated as text mime-type (or whatever is needed so that I can view patch diffs) automatically?
Thanks.

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• application/octet-stream attachment: TestUnit.sj