This may be a nightmare to do retrospectively, but.....

What I have always done is have filenames in a coherent format.
When I download something new I archive it in the following format.

I start with the vendor name, then the character it is for then the name.
I have promo jpgs of the product too similarly named.

Eg. Merchant XYZ V4 Sally

Then you get each merchants product together ( I use seperate folders for that anyway)
Sub sort on base character, so all your V4 characters will be together alphabetically

Got to admit though, when you have texture sets it gets a little more complex & long winded.
I then start with the product it is for then the texture pack details.
This at least lets things sort together.

Klutz.

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