Here is something which might come in handy for finding the paths of texture files. I often forget where I put a texture file. I use the "Texture Manager" to see the file names, complete with paths, of the last 11 texture files I used.
If you don't know how to do this, follow these steps the first time.

1. In the P5 Materials Room, click (on Diffuse Color, for example) to create a "New Node... 2D Textures... Image Map".
2. After the Image Map node is created, click on the Image Source filename (the default is "none"). This opens the "Texture Manager".
3. Click on the filename (or "None") in the Texture Manager.
4. You will see a list of your recently used filenames, complete with paths.
   And you can select a filename by clicking on any name in this list.