Thanks every one. I have now been able to load ANY style from the PSR2000 that I have tried. The answer came from the PK forum. The same problem applies to prior versions of keyboards, including the 9000. I found styles from the 2000 are quite improved from the 740. Here is a copy of the PK message, for potential benefit to others with similar problem:
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The problem is NOT the file size, but some additional OTS information in the end of the style file. This additional has to be removed.

This subject has been discussed in the psr-styles-group (link from my site, see below) lateley and I think some/most of the PSR 2000 styles have been modified for use in PSR 740 (and other models which don't accept this additional information).

If you cant find the modified styles, you can modify the styles your self this way:
- Open the PSR 2000 style in an hexidecimal editor (freeware: WinHex, HexEdit etc.)
- Search for "OTSc"
- Delete from (AND including) the first occurence of "OTSc" to the end of the file.
- Save

Jørgen
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I used the HexEdit.

MBL