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C51 runs on XP but does nothing

Hi,

I've seen the various threads regarding C51 not runnning on windows XP, and I have a variation on the same theme.

The version I run is v5.5, unprotected, ie no licence dongle / licence file. If I run, say, a51 or bl51, the application is invoked normally. If I run c51, it does nothing and I get a blank line, and then the c:\whatever prompt. Nothing I can find on the support site actually addresses this, although there are similar problems. I can't upgrade the compiler due to the customer, and I can't downgrade my pc. I've tried various things like increasing memory, playing with the environment.

Some of my colleagues run this, incidentally, and have no problems on xp with it. What have I done to offend my pc?

Any help gratefully received.

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