Program DISTANCE maximum observations?

Does anyone know if there is a maximum number of observations that Program DISTANCE can handle or maximum number of integers for labels? I have a dataset with over 40,000 observations on birds. The maximum distance is 1000 m on observations and the largest cluster size is 75. The transect name is a maximum of 8 digits.
Probably should learn R, right?
Yes, heard it before. Thanks in advance.
Shaun Oldenburger
Texas Parks and Wildlife Department
-- End of Analyis Engine Log File --
** Warning: Analysis engine wrote some output to the console error stream, reproduced below. **
-- Start of Console Error Stream --
forrtl: severe (165): Program Exception - integer overflow
Image PC Routine Line Source
MCDS.exe 0047B56A PRTLAB 23 Labels.for
-- End of Console Error Stream --
Analysis engine status 'Run failed - analysis engine encountered an unknown error, possibly in the input or output files'
Reading Results
Run finished
Probably should learn R, right?

Shaun Oldenburger
Texas Parks and Wildlife Department
-- End of Analyis Engine Log File --
** Warning: Analysis engine wrote some output to the console error stream, reproduced below. **
-- Start of Console Error Stream --
forrtl: severe (165): Program Exception - integer overflow
Image PC Routine Line Source
MCDS.exe 0047B56A PRTLAB 23 Labels.for
-- End of Console Error Stream --
Analysis engine status 'Run failed - analysis engine encountered an unknown error, possibly in the input or output files'
Reading Results
Run finished