fatal allocation error when allocating x bytes

[MikeParr]

Here is a program with a problem.

//---- shows: fatal allocation error when allocating x bytes
size=55000
outString=strBuffer(size) // this line gives the error
//----

I'm running it under Windows 7.

When size is (e.g.) 55000, it displays an allocation error,

When size i s(e.g) 33000, it runs ok.

I'm using strings to contain the contents of whole files, and have a
program that works for
small files, not larger ones.
Any ideas?
Best wishes
Mike